Datasheet

Data Sheet AD7762
Rev. A | Page 3 of 28
SPECIFICATIONS
AV
DD1
= DV
DD
= V
DRIVE
= 2.5 V, AV
DD2
= AV
DD3
= AV
DD4
= 5 V, V
REF
= 4.096 V, MCLK amplitude = 5 V, T
A
= 25°C, normal mode,
using on-chip amplifier with components as shown in Table 8, unless otherwise noted.
1
Table 2.
Parameter Test Conditions/Comments Specification Unit
DYNAMIC PERFORMANCE
Decimate by 256 MCLK = 40 MHz, ODR = 78 kHz, FIN = 1 kHz
Dynamic Range Modulator inputs shorted 119
120.5
dB min
dB typ
Signal-to-Noise Ratio (SNR)
2
Input amplitude = −0.5 dBFS 112 dB typ
Input amplitude = −60 dBFS 59 dB typ
Spurious-Free Dynamic Range (SFDR) Nonharmonic, input amplitude = −6 dBFS 126 dBc typ
Input amplitude = −60 dBFS 77 dBc typ
Total Harmonic Distortion (THD) Input amplitude = −0.5 dBFS −105 dB typ
Input amplitude = −6 dBFS −106 dB typ
Input amplitude = −60 dBFS −75 dB typ
Decimate by 64
MCLK = 40 MHz, ODR = 312.5 kHz, F
IN
= 1 kHz
Dynamic Range Modulator inputs shorted
112
114
dB min
dB typ
Signal-to-Noise Ratio (SNR)
2
Input amplitude = −0.5 dBFS 109.5 dB typ
Spurious-Free Dynamic Range (SFDR) Nonharmonic, input amplitude = −6 dBFS 126 dBc typ
Decimate by 32 MCLK = 40 MHz, ODR = 625 kHz, FIN =100 kHz
Dynamic Range
Modulator inputs shorted
108
109.5
dB min
dB typ
Signal-to-Noise Ratio (SNR)
2
Input amplitude = −0.5 dBFS 107 dB typ
Spurious-Free Dynamic Range (SFDR) Nonharmonic, input amplitude = −6 dBFS 120 dBc typ
Total Harmonic Distortion (THD) Input amplitude = −0.5 dBFS −108 dB typ
Input amplitude = −6 dBFS
−106
dB typ
DC ACCURACY
Resolution 24 Bits
Differential Nonlinearity
Guaranteed monotonic to 24 bits
Integral Nonlinearity 0.00076 % typ
Zero Error 0.014 % typ
0.02 % max
Gain Error 0.015 % typ
Zero Error Drift 0.019 %/°C typ
Gain Error Drift 0.0002 %/°C typ
DIGITAL FILTER RESPONSE
Decimate by 32
Group Delay MCLK = 40 MHz 47 µs typ
Decimate by 64
Group Delay MCLK = 40 MHz 91.5 µs typ
Decimate by 256
Group Delay MCLK = 40 MHz 358 µs typ
ANALOG INPUT
Differential Input Voltage V
IN
(+) – V
IN
(−), V
REF
= 2.5 V ±2 V p-p
V
IN
(+) – V
IN
(−), V
REF
= 4.096 V ±3.25 V p-p
Input Capacitance
At internal buffer inputs
5
pF typ
At modulator inputs 55 pF typ