Texas Instruments ADS5237 EVM User manual

ADS5231/32/37 EVM
User's Guide
November 2007 Wireless Infrastructure - Radio
SBAU111B

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Contents
1 Overview .................................................................................................................... 51.1 Purpose............................................................................................................ 51.2 EVM Basic Functions ............................................................................................ 51.3 Power Requirements ............................................................................................ 51.4 ADS5231/32/37 EVM Operational Procedure ................................................................ 62 Circuit Description ...................................................................................................... 62.1 Schematic Diagram .............................................................................................. 62.2 Circuit Function ................................................................................................... 63 EVM Use With the TSW1100 ......................................................................................... 83.1 Connecting to the TSW1100.................................................................................... 83.2 Provide Power to the ADS5231/32/37 EVM .................................................................. 93.3 Providing Power to the TSW1100 ............................................................................. 93.4 Connecting to the USB .......................................................................................... 93.5 Launching the TSW1100 Software ............................................................................ 93.6 Using the TSW1100 Software .................................................................................. 94 Physical Description .................................................................................................... 94.1 PCB Layout ...................................................................................................... 105 Parts List and Schematics .......................................................................................... 16
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List of Figures
1 Top Layer .................................................................................................................... 102 Layer 2, Ground Plane .................................................................................................... 113 Layer 3, Power Plane #1 .................................................................................................. 124 Layer 4, Power Plane #2 .................................................................................................. 135 Layer 5, Ground Plane .................................................................................................... 146 Layer 6, Bottom Layer ..................................................................................................... 15
List of Tables
1 Three-Pin Jumper List ...................................................................................................... 62 Output Connectors J8 and J21 ............................................................................................ 83 Test Point Descriptions ..................................................................................................... 84 ADS5231/32/37 EVM Parts List .......................................................................................... 16
4List of Figures SBAU111B – May 2006 – Revised November 2007Submit Documentation Feedback

1 Overview
1.1 Purpose
1.2 EVM Basic Functions
1.3 Power Requirements
User's GuideSBAU111B – May 2006 – Revised November 2007
ADS5231/32/37 EVM
This preliminary user’s guide gives a general overview of the ADS5231/32/37 evaluation module (EVM),and provides a general description of the features and functions to be considered while using this module.
The ADS5231/32/37 EVM provides a platform for evaluating the ADS5231/32/37 dual, 12-bit,analog-to-digital converter (ADC) under various signal, reference, and supply conditions. This documentshould be used in combination with the EVM schematic diagram supplied.
Analog inputs to the ADC are provided via external SMA connectors. The single-ended input the userprovides is converted into a differential signal at the input of the device for both channels. Both analoginput channels of the ADS5231/32/37 EVM have two independent paths. One input path uses a differentialamplifier, while the other path is transformer-coupled.
The EVM provides an external SMA connector for input of the ADC clock. The single-ended input that theuser provides is transformer-coupled to provide a differential signal at both clock inputs of the device. TheEVM also allows the user to send a single-ended or true-differential clock if desired.
Digital outputs from the EVM are via two 40-pin connectors. The digital outputs from the ADC are bufferedbefore going to the connectors. The digital output connectors can be mated to TI's TSW1100 for digitalcapture.
Power connections to the EVM are via banana jack sockets. Separate sockets are provided for the ADCanalog and output driver supplies, external buffers supply, and differential amplifiers supply.
The EVM can be powered directly with only a single 3.3-V supply if using the module withtransformer-coupled input and internal reference mode. ±5 V is required if using the differential amplifierinput. A provision has been made to allow the EVM to be powered with independent analog and digitalsupplies to provide higher performance.
Voltage Limits
Exceeding the maximum input voltages can damage EVM components. Undervoltage may causeimproper operation of some or all of the EVM components.
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1.4 ADS5231/32/37 EVM Operational Procedure
*dBFS +20 logǒcaptured max code *captured min code
2NǓ,N is the number of bits
2 Circuit Description
2.1 Schematic Diagram
2.2 Circuit Function
Circuit Description
The ADS5231/32/37 EVM provides a flexible means of evaluating the ADS5231/32/37 in a number ofmodes of operation. A basic setup procedure that can be used as a board confidence check is as follows:1. Verify all jumper settings against the schematic jumper list in Table 1 :2. Connect supplies to the EVM as follows:•3.3-V ADC output buffer supply to J17 and return to J18.•3.3-V ADC analog supply to J11 and return to J10.3. Switch power supplies on4. Use a function generator with 50- Ωoutput to input a 45-MHz, 1.5-V offset, 3-V square-wave signal intoJ3. The frequency of the clock must be within the specification for the device speed grade. Caution:the ADS5231/32/37 does not work with a sinusoidal clock source.5. Use frequency generators with a 50- Ωoutput to provide a 10.1-MHz, 0-V offset, –1-dBFS amplitude,sine-wave signal into J15 and J16. This provides a transformer-coupled differential input signal to bothchannels of the ADC. A full-scale input tone into channel A or channel B can be calculated by usingthe following formula:
6. The digital patterns on output connectors J8 and J21 should now represent a sine wave and can bemonitored using a logic analyzer or TSW1100.
Table 1. Three-Pin Jumper List
Jumper Function Location: Pins 1- 2 Location: Pins 2-3 Default
W1 Reference select Internal reference External reference 1-2W2 Channel B output enable Output disabled Output enabled 2-3W3 Power down select Power-down mode Operate mode 2-3W4 Channel A output enable Output disabled Output enabled 2-3SJP1 Common-mode voltage-path provider Common-mode voltage to CHA Provide common-mode voltage 2-3differential amplifier to transformer T1W9 Invert most significant bit 2s complement Offset binary 2-3SJP3 Common-mode voltage path Provide common-mode voltage Provide common-mode voltage 2-3to CHB differential amplifier to transformer T2
The schematic diagram for the EVM is attached to the end of this document.
The following paragraphs describe the function of individual circuits. See the ADS5232 Dual, 12-Bit,65MSPS, +3.3V Analog-to-Digital Converter data sheet (SBAS294 ), the ADS5231 Dual, 12-Bit, 40MSPS,+3.3V Analog-to-Digital Converter data sheet (SBAS295 ), or the ADS5237 Dual, 10-Bit, 65MSPS, +3.3VAnalog-to-Digital Converter data sheet (SBAS420 ) for device operating characteristics.
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2.2.1 Analog Inputs
2.2.2 Clock Input
2.2.3 Control Inputs
2.2.3.1 Output Enable
2.2.3.2 MSB Control
2.2.3.3 Power Down
2.2.3.4 External Reference
2.2.4 Power
Circuit Description
The EVM can be configured to provide the ADC with either transformer-coupled or differential amplifierinputs from a single-ended source. The inputs are provided via SMA connectors J15 and J16 fortransformer-coupled input, and J1, J2, J7, and J9 for differential amplifier input. To set up for one of theseoptions, the EVM must be configured as follows:1. For a 1:1 transformer-coupled input to the ADC, a single-ended source is connected to J15 for channelA and J16 for channel B. R5, R6, R8, and R9 must not be installed. This is the default configuration forthe EVM.2. For single-ended inputs into the differential amplifiers, sources are connected to J2 for channel A andJ9 for channel B. R5, R6, R8, and R9 must be installed, and R74, R75, R78, and R79 removed.3. For a differential input into the amplifiers, the positive source of channel A is connected to J2 and thenegative source to J1. The positive source of channel B is connected to J9 and the negative source toJ7. R5, R6, R8, and R9 must be installed, and R74, R75, R78, and R79 removed. R19 and R22 mustbe replaced with 383- Ωresistors, and R12 and R14 must be replaced with 54.9- Ωresistors for propertermination.
To provide a clock to the ADS5231/32/37, apply a 3.3-V, 1.65-V offset, square-wave input to J3. This inputis terminated with a 50- Ωresistor to ground. Caution: the ADS5231/32/37 does not work with asinusoidal clock source.
The EVM has five discrete inputs to control the operation of the device.
With jumper W4 installed between pins 2 and 3, channel A of the ADC is enabled. This channel isdisabled with the jumper installed between pins 1 and 2. With jumper W2 installed between pins 2 and 3,channel B is enabled. Channel B is disabled with the jumper installed between pins 1 and 2.
With jumper W9 installed between pins 2 and 3, the outputs of the ADC are straight binary. The outputsare 2s complement with jumper W9 installed between pins 1 and 2.
With jumper W3 installed between pins 1 and 2, the ADC is in power-down mode.
With jumper W1 installed between pins 1 and 2, the ADC is in internal reference mode. The device is inexternal reference mode with jumper W1 installed between pins 2 and 3. When using the externalreference mode, install R3 and R4. Use the potentiometers R17 and R18 to adjust the corresponding topreference and bottom reference. For convenience, two test points, TP6 and TP7, allow monitoring thevoltage while using the external reference mode.
Power is supplied to the EVM via banana jack sockets. Separate connections are provided for a 3.3-Vanalog supply (J11 and J10), 3.3-V driver supply, external buffer supply (J17 and J18), and ±5-V amplifiersupply (J14, J13, and J12).
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2.2.5 Outputs
3 EVM Use With the TSW1100
3.1 Connecting to the TSW1100
EVM Use With the TSW1100
The data outputs from the ADC are buffered using two Texas Instruments SN74AVC16244s. Output dataheaders J8 and J21 are standard 40-pin headers on a 100-mil grid, and allow easy connection to a logicanalyzer or TSW1100. The connector pinout is listed in Table 2 . Furthermore, five test points are provided.They are listed in Table 3 .
Table 2. Output Connectors J8 and J21
DESCRIPTION DESCRIPTIONPIN NO. PIN NO.ADS5231/ADS5232 ADS5237 ADS5231/ADS5232 ADS5237
1 CLK OUT CLK OUT 2 GND GND3 NC NC 4 GND GND5 NC NC 6 GND GND7 NC NC 8 GND GND9 D11 (MSB) D9 (MSB) 10 GND GND11 D10 D8 12 GND GND13 D9 D7 14 GND GND15 D8 D6 16 GND GND17 D7 D5 18 GND GND19 D6 D4 20 GND GND21 D5 D3 22 GND GND23 D4 D2 24 GND GND25 D3 D1 26 GND GND27 D2 D0 (LSB) 28 GND GND29 D1 NC 30 GND GND31 D0 (LSB) NC 32 GND GND33 NC NC 34 GND GND35 NC NC 36 GND GND37 NC NC 38 GND GND39 NC NC 40 GND GND
Table 3. Test Point Descriptions
Test Point Function
TP1 GNDTP3 GNDTP4 GNDTP6 Bottom reference voltage when forcing external voltage (typical = 1 V)TP7 Bottom reference voltage when forcing external voltage (typical = 2 V)
The ADS5231/32/37 EVM allows for connection to the TSW1100, allowing easy capture and analysis ofthe ADC digital output data. See the TSW1100 Data Capture Board Quick Start Guide (SLAU155 ) andTSW1100 User’s Guide (SLAU164 ) for more information.
Gently insert the ADS5231/32/37 EVM output connectors J8 and J21 into the TSW1100 input connectorsJ2 and J1, respectively.
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3.2 Provide Power to the ADS5231/32/37 EVM
3.3 Providing Power to the TSW1100
3.4 Connecting to the USB
3.5 Launching the TSW1100 Software
3.6 Using the TSW1100 Software
4 Physical Description
Physical Description
Follow the steps in Section 1.4 and power on the ADS5231/32/37 EVM.
Use either a wall-mount transformer that has an output rating of 12 VDC and 500 mA or a lab powersupply that can supply 12 VDC. Connect the output to J8 and the return to J9. Texas Instrumentsrecommends setting a current limit of 500 mA. Power on the TSW1100.
With the PC turned on, connect the USB cable from the PC to the TSW1100 USB connector, J10. At thispoint, the PC should recognize the TSW1100. To verify, go to the Hardware Device Manager, select USBDevice, and ensure the TSW1100 is listed as a USB device. At this point, LED D13 lights on theTSW1100, signaling that the device has been configured properly and is communicating with the PC. Thisshould be the only lighted LED. If at this point more than D13 is lighted, depress the reset switch, SW2, onthe TSW1100.
With the TSW1100 recognized by the hardware device manager, the software package can be run. To runthe program, click on Start →Program Files →Texas Instruments →TI ADC Capture Card.
Using the TI chip selector, select the ADS5231/32/37. The software then configures itself for operationwith the ADS5231/32/37 EVM. Fill in the appropriate fields describing the hardware setup conditions.When finished, acquire data by clicking on the red circular Acquire Data button.
This chapter describes the physical characteristics of the PCB, providing the layout of each board layer.
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4.1 PCB Layout
Physical Description
The EVM is constructed on a 6-layer, 5.15-inch ×5.05-inch, 0.062-inch thick PCB using FR-4 material.The individual layers are shown in Figure 1 through Figure 6 .
Figure 1. Top Layer
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Physical Description
Figure 2. Layer 2, Ground Plane
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Physical Description
Figure 3. Layer 3, Power Plane #1
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Physical Description
Figure 4. Layer 4, Power Plane #2
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Physical Description
Figure 5. Layer 5, Ground Plane
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Physical Description
Figure 6. Layer 6, Bottom Layer
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5 Parts List and Schematics
Parts List and Schematics
Table 4 lists the parts used in constructing the EVM. The EVM schematics are appended at the end of thissection.
Table 4. ADS5231/32/37 EVM Parts List
Value QTY Part Number Vendor Ref Des Not
Installed
CAPACITORS
47-µF, tantalum, 20%, 10-V 5 ECS-T1AD476R Panasonic C19 C21 C75 C81 C82capacitor
10-µF, 10-V, 20% capacitor 8 ECS-T1AX106R Panasonic C23 C27 C46 C47 C48 C83 C87C8810-µF, 10-V, 10% capacitor 4 T491A106K010AS KEMET C12 C20 C22 C260.47-pF, 100-V, 10% capacitor 10 ECJ-1VB2A471K Panasonic C33 C34 C57 C59 C61 C63C109 C110 C111 C1120.047-µF, 16-V, 10% capacitor 2 ECJ-1VB1H473K Panasonic C50 C510.01-µF, 50-V, 10% capacitor 5 ECJ-1VB1C103K Panasonic C55 C94 C95 C96 C970.1-µF, 16-V, 10% capacitor 25 ECJ-1VB1C104K Panasonic C8 C10 C13 C15 C41 C42 C43 C7C44 C58 C60 C62 C64 C65 C66C70 C73 C74 C80 C84 C85 C86C89 C90 C91 C92 C931-µF, 6.3-V, 10% capacitor 1 ECJ-1VB0J105K Panasonic C532.2-µF, 6.3-V, 10% capacitor 1 ECJ-1VF0J225Z Panasonic C560.1-µF, 16-V, 10% capacitor 7 ECJ-0EF1C104Z Panasonic C2–C6 C9 C2827-pF, 50-V, 5% capacitor 0 ECU-E1H270JCQ Panasonic C107 C108
RESISTORS
0- Ωresistor, 1/16-W, 1% 2 ERJ-6ENF0R00V Panasonic R12 R1454.9- Ωresistor, 1/16-W, 1% 2 ERJ-6ENF54R9V Panasonic R82 R83383- Ωresistor, 1/16-W, 1% 2 ERJ-6ENF3830V Panasonic R28 R33392- Ωresistor, 1/16-W, 1% 4 ERJ-6ENF3920V Panasonic R35 R36 R40 R41412 Ωresistor, 1/16 W, 1% 2 ERJ-6ENF4120V Panasonic R19 R220- Ωresistor, 1/16-W, 1% 3 ERJ-3GEY0R00V Panasonic C1 R42 R102 R3 R4 R5R6 R8 R9100- Ωresistor, 1/16-W, 1% 6 ERJ-3EKF1000V Panasonic R23 R24 R74 R75 R78 R7924.9- Ωresistor, 1/16-W, 1% 4 ERJ-3EKF24R9V Panasonic R43 R45 R49 R6149.9- Ωresistor, 1/16-W, 1% 5 ERJ-3EKF49R9V Panasonic R2 R7 R13 R70 R712-k Ωresistor, 1/16-W, 1% 4 ERJ-3EKF2001V Panasonic R15 R26 R27 R2956.2-k Ωresistor, 1/16-W, 1% 1 ERJ-3EKF5622V Panasonic R14.99-k Ωresistor, 1/16-W, 1% 2 ERJ-3EKF4991V Panasonic R16 R3410-k Ωresistor, 1/16-W, 1% 2 ERJ-3EKF1002V Panasonic R20 R211-k Ωvariable resistor 2 CT94W102 CERMET R17 R180- ΩR-pack, EXB-38V series 6 EXB-38V000JV Panasonic RP1–RP6
CONNECTORS, JUMPER, HEADERS, FERRITE BEADS, TRANSFORMERS, IC's
Ferrite bead 8 EXC-ML32A680U FB1 FB2 FB3 FB5-FB9 FB4Transformer 2 ADT4-1WT Mini-Circuits T1 T2SMA connectors 7 2262-0000-09 Newark J1 J2 J3 J7 J9 J15 J16Black test point 3 5011K-ND Keystone TP1 TP3 TP4Red test point 2 5010K-ND Keystone TP6 TP73POS_header 5 TSW-150-07-L-S Samtec W1 W2 W3 W4 W940-pin IDC connector 2 TSW-120-07-L-D Samtec J8 J21Red banana jacks 4 ST-351A Allied J11 J13 J14 J17Black banana jacks 3 ST351B Allied J10 J12 J18
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Parts List and Schematics
Table 4. ADS5231/32/37 EVM Parts List (continued)
Value QTY Part Number Vendor Ref Des Not
Installed
ADS5231, ADS5232, or ADS5237 1 ADS5231, ADS5232, TI U1or ADS5237THS4503 2 THS4503ID TI U2 U9OPA2227UA 1 OPA2227UA TI U3TPS79225 1 TPS79225 TI U4SN74AVC16244 2 SN74AVC16244DGG TI U7 U10Screw, machine, PH 4-40 ×3/8 4 PMS 440 0038 PH Building
FastenersStandoff, hex .5/4-40THR, nylon 4 1902C Keystone
Electronic
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C6
.1uF
C5
.1uF
C4
.1uF
ADS5232
A
16
J. SETON
Y. DEWONCK
C9
.1uF
+C22
10uF
+C26
10uF
AVDD
VDRV
C3
.1uF
C2
.1uF
C28
.1uF
Note 1. Part not installed
B[1..12] B[1..12]
(Sh 4) A[1..12]
A[1..12] (Sh 3)
OVRA OVRA
OVRB
1
3
2
W9
(Sh 4) (Sh 3)
(Sh 2)
(Sh 2)
(Sh 2)
(Sh 2)
AGND
1AGND
2AVDD
3GND
4VDRV
5OEb_
6GND
7VDRV
8OVRb
9B12 (LSB)
10 B11
11 B10
12 B9
13 B8
14 B7
15 B6
16
B5
17 B4 18 B3 19 B2 20 B1 (MSB) 21 DVb 22 GND 23 CLK 24 GND 25 DVa 26 A12 (LSB) 27 A11 28 A10 29 A9 30 A8 31 A7 32
A6 33
A5 34
A4 35
A3 36
A2 37
A1 (MSB) 38
OVRa 39
VDRV 40
MSBI 41
OEa_ 42
VDRV 43
GND 44
STPD 45
AVDD 46
AGND 47
AGND 48
AGND 49
INa 50
INa_ 51
CM 52
REFT 53
REFB 54
GND 55
INT/EXT_ 56
AVDD 57
AGND 58 AGND 59
ISET 60
AGND 61
INb_ 62
INb 63
AGND 64
U1
ADS5232
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12 A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
CLK
DVA
DVB
INA
INA_INB_
INB
INB
INB_ INA_
INA
VDRV
1
3
2W4
VDRV
1
3
2
W2
VDRV
1
3
2W3
VDRV
1
3
2
W1
VDRV
R1
56.2K
REFT
REFB
CM
CM
REFT
REFB
1
2
3 4 5
J3
SMA_PCB_MT_MOD
R2
49.9
DVA
DVB
(Sh 2)
Sh 3)
Sh 4)
(Sh 5)
(Sh 5)
(1-2) INTERNAL
(2-3)
(2-3) NORMAL
(2-3)
(2-3) SOB
C1
0
R10 2
R11
2
(1-2) POWER DOWN
(2-3) EXTERNAL
(1-2) BTC

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C95
.01uF
1
2
3 4 5
J15
AIN_A
R70
49.9
INPUT_CMLA
R75
24.9
R74
24.9 C107
27pF
INA
INA_
INA
INA_
ADS5232
A
26
J. SETON
Y. DEWONCK
(Sh 1)
(Sh 1)
5
4
8
1
2
+
-
VOCM
VOUT-
VOUT+
36
+VCC
-VCC
7
NC
U2
THS4503
1
2
3 4 5
J2
1
2
3 4 5
J1
R82
54.9
R12
0
R19
412
R28
383
R36
392
R35
392
INA
INA_
+VCC
-VCC
R45
24.9
R43
24.9
3 1
2
SJP1
Note 1. Part not installed
(Note 1)
C94
.01uF
(2-3)
AINA+
AINA-
C70
.1uF
C80
.1uF
C97
.01uF
1
2
3 4 5
J16
AIN_B
R71
49.9
INPUT_CMLB
R79
24.9
R78
24.9 C108
27pF
INB
INB_
INB
INB_ (Sh 1)
(Sh 1)
5
4
8
1
2
+
-
VOCM
VOUT-
VOUT+
36
+VCC
-VCC
7
NC
U9
THS4503
1
2
3 4 5
J9
1
2
3 4 5
J7
R83
54.9
R14
0
R22
412
R33
383
R41
392
R40
392
INB
INB_
+VCC
-VCC
R49
24.9
R61
24.9
3 1
2
SJP3
(Note 1)
C96
.01uF
(2-3)
AINB+
AINB-
C85
.1uF
C84
.1uF
CM CM Sh 1)
R5
0
(Note 1)
R6
0
(Note 1)
R8
0
(Note 1)
R9
0
(Note 1)
3
1 6
5
4
2
T1
ADT1-1WT
3
1 6
5
4
2
T2
ADT1-1WT

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ADS5232
A
36
J. SETON
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1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
J8
40PIN_IDC
C57
470pF
C58
.1uF
C60
.1uF
C62
.1uF
C64
.1uF
C59
470pF
C61
470pF
C63
470pF
DVA DVA
+C20
10uF
(Sh 1)
(Sh 1) A[1..12] A[1..12]
OVR1_O
CA_OUT
DRVDD
1OEB 1
1Y1 2
1Y2 3
GND 4
1Y3 5
1Y4 6
VCC 7
2Y1 8
2Y2 9
GND 10
2Y3 11
2Y4 12
3Y1 13
3Y2 14
GND 15
3Y3 16
3Y4 17
VCC 18
4Y1 19
4Y2 20
GND 21
4Y3 22
4Y4 23
4OEB 24 3OEB
25 4A4
26 4A3
27 GND
28 4A2
29 4A1
30 VCC
31 3A4
32 3A3
33 GND
34 3A2
35 3A1
36 2A4
37 2A3
38 GND
39 2A2
40 2A1
41 VCC
42 1A4
43 1A3
44 GND
45 1A2
46 1A1
47 2OEB
48
U7
SN74AVC16244DGG
Note 1. Part not installed
DAO1
DAO2
DAO3
DAO4
DAO5
DAO6
DAO7
DAO8
DAO9
DAO10
DAO11
DAO12
R102
0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
1 8
2 7
3 6
4 5
RP1
0
1 8
2 7
3 6
4 5
RP3
0
1 8
2 7
3 6
4 5
RP2
0
DRVDD
1 8
2 7
3 6
4 5
RP7
0
1 8
2 7
3 6
4 5
RP9
0
1 8
2 7
3 6
4 5
RP8
0
RA1
RA2
RA3
RA4
RA5
RA6
RA7
RA8
RA9
RA10
RA11
RA12