ADS8674
,
ADS8678
SBAS627 –JULY 2015
www.ti.com
Electrical Characteristics (continued)
Minimum and maximum specifications are at TA= –40°C to 125°C. Typical specifications are at TA= 25°C.
AVDD = 5 V, DVDD = 3 V, VREF = 4.096 V (internal), and fSAMPLE = 500 kSPS, unless otherwise noted. TEST
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LEVEL(1)
DYNAMIC CHARACTERISTICS
Input range = ±2.5 × VREF 84.5 85 A
Input range = ±1.25 × VREF 84.2 85 A
Input range = ±0.625 × VREF 83.5 84.5 A
Input range = ±0.3125 × VREF 80 82 A
Signal-to-noise ratio
SNR Input range = ±0.15625 × VREF 75 77 dB A
(VIN – 0.5 dBFS at 1 kHz) Input range = 2.5 × VREF 84 85 A
Input range = 1.25 × VREF 83.5 84.5 A
Input range = 0.625 × VREF 80 82 A
Input range = 0.3125 × VREF 75 77 A
Total harmonic distortion(7)
THD All input ranges –100 dB B
(VIN – 0.5 dBFS at 1 kHz)
Input range = ±2.5 × VREF 84.3 84.8 A
Input range = ±1.25 × VREF 84 84.8 A
Input range = ±0.625 × VREF 83.3 84.3 A
Input range = ±0.3125 × VREF 80 82 A
Signal-to-noise ratio
SINAD Input range = ±0.15625 × VREF 75 77 dB A
(VIN – 0.5 dBFS at 1 kHz) Input range = 2.5 × VREF 83.8 84.8 A
Input range = 1.25 × VREF 83.3 84.3 A
Input range = 0.625 × VREF 80 82 A
Input range = 0.3125 × VREF 75 77 A
Spurious-free dynamic range
SFDR All input ranges 101 dB B
(VIN – 0.5 dBFS at 1 kHz)
Aggressor channel input overdriven
Crosstalk isolation(8) 110 dB B
to 2 × maximum input voltage
Aggressor channel input overdriven
Crosstalk memory(9) 90 dB B
to 2 × maximum input voltage
BW(–3 dB) Small-signal bandwidth, –3 dB At TA= 25°C, all input ranges 15 kHz B
BW(–0.1 dB) Small-signal bandwidth, –0.1 dB At TA= 25°C, all input ranges 2.5 kHz B
AUXILIARY CHANNEL
Resolution 14 Bits A
V(AUX_IN) AUX_IN voltage range (AUX_IN – AUX_GND) 0 VREF V A
AUX_IN 0 VREF V A
Operating input range AUX_GND 0 V A
During sampling 75 pF C
CiInput capacitance During conversion 5 pF C
IIkg(in) Input leakage current 100 nA A
DNL Differential nonlinearity –0.75 ±0.5 0.75 LSB A
INL Integral nonlinearity –1 ±0.5 1 LSB A
EG(AUX) Gain error At TA= 25°C ±0.02 ±0.2 %FSR A
EO(AUX) Offset error At TA= 25°C –5 5 mV A
SNR Signal-to-noise ratio V(AUX_IN) = –0.5 dBFS at 1 kHz 83.3 84.4 dB A
THD Total harmonic distortion(7) V(AUX_IN) = –0.5 dBFS at 1 kHz –100 dB B
SINAD Signal-to-noise + distortion V(AUX_IN) = –0.5 dBFS at 1 kHz 83 84.3 dB A
SFDR Spurious-free dynamic range V(AUX_IN) = –0.5 dBFS at 1 kHz 100 dB B
(7) Calculated on the first nine harmonics of the input frequency.
(8) Isolation crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel, not selected in the multiplexing
sequence, and measuring its effect on the output of any selected channel.
(9) Memory crosstalk is measured by applying a full-scale sinusoidal signal up to 10 kHz to a channel that is selected in the multiplexing
sequence, and measuring its effect on the output of the next selected channel for all combinations of input channels.
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