Datasheet
AD7764
Rev. A | Page 4 of 32
Parameter Test Conditions/Comments Specification Unit
Decimate 64×
Normal Power Mode MCLK = 40 MHz, ODR = 312.5 kHz, f
IN
= 1 kHz sine wave
Dynamic Range
Modulator inputs shorted 109 dB typ
105 dB min
Differential amplifier inputs shorted 107.3 dB typ
Signal-to-Noise Ratio (SNR)
2
104 dB typ
102.7 dB min
Spurious-Free Dynamic Range (SFDR)
Nonharmonic 130 dBFS typ
Total Harmonic Distortion (THD)
Input amplitude = −0.5 dB −105 dB typ
Input amplitude = −6 dB −103 dB typ
Intermodulation Distortion (IMD) Input amplitude = −6 dB, f
IN
A = 100.3 kHz, f
IN
B = 97.3 kHz
Second-order terms −118 dB
Third-order terms −108 dB
Low Power Mode
Dynamic Range Modulator inputs shorted 106 dB typ
105 dB min
Differential amplifier inputs shorted 105.3
Signal-to-Noise Ratio (SNR)
2
Input amplitude = −0.5 dB 103 dB typ
102 dB min
Spurious-Free Dynamic Range (SFDR) Nonharmonic 110 dBFS typ
Total Harmonic Distortion (THD) Input amplitude = −0.5 dB −105 dB typ
Input amplitude = −6 dB −111 dB typ
−100 dB max
DC ACCURACY
Resolution Guaranteed monotonic to 24 bits 24 Bits
Integral Nonlinearity Normal power mode 0.0036 % typ
Low power mode 0.0014 % typ
Zero Error Normal power mode 0.006 % typ
0.03 % max
Including on-chip amplifier 0.04 % typ
Low power mode 0.002 % typ
0.024 % max
Gain Error 0.018 % typ
Including on-chip amplifier 0.04 % typ
Zero Error Drift 0.00006 %FS/°C typ
Gain Error Drift 0.00005 %FS/°C typ
DIGITAL FILTER CHARACTERISTICS
Pass-Band Ripple 0.1 dB typ
Pass Band
3
−1 dB frequency ODR × 0.4016 kHz
−3 dB Bandwidth
3
ODR × 0.4096 kHz
Stop Band
3
Beginning of stop band ODR × 0.5 kHz
Stop-Band Attenuation Decimate 64× and decimate 128× modes −120 dB typ
Decimate 256× −115 dB typ
Group Delay
Decimate 64× MCLK = 40 MHz 89 µs typ
Decimate 128× MCLK = 40 MHz 177 µs typ
Decimate 256× MCLK = 40 MHz 358 µs typ
ANALOG INPUT
Differential Input Voltage
Modulator input pins: V
IN
+ − V
IN
−, V
REF
+ = 4.096 V ±3.2768 V p-p
Input Capacitance At on-chip differential amplifier inputs 5 pF typ
At modulator inputs 29 pF typ