AD7768BSTZ datasheet(5/106 Pages) AD

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Data Sheet

AD7768/AD7768-4

SPECIFICATIONS

analog.com

Rev. C | 5 of 106

AVDD1A = AVDD1B = 4.5 V to 5.5 V, AVDD2A = AVDD2B = 2.0 V to 5.5 V, IOVDD = 2.25 V to 3.6 V, AVSS = DGND = 0 V, REFx+ = 4.096 V

and REFx− = 0 V, MCLK = 32.768 MHz, analog input precharge buffers on, reference precharge buffers off, wideband filter, chopping frequency

(fCHOP) = fMOD/32, TA = −40°C to +105°C, unless otherwise noted. See Table 2 for specifications at 1.8 V IOVDD.

Table 1.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

ADC SPEED AND PERFORMANCE

Output Data Rate (ODR), per

Channel1

Fast mode

256

kSPS

Median mode

128

kSPS

Low power mode

kSPS

−3 dB Bandwidth

Fast mode, wideband filter

110.8

kHz

Median mode, wideband filter

55.4

kHz

Low power mode, wideband filter

13.8

kHz

Data Output Coding

Twos complement, MSB first

No Missing Codes2

Bits

DYNAMIC PERFORMANCE

Fast Mode

Decimation by 32, 256 kSPS ODR

Dynamic Range

Shorted input, wideband filter

106.2

108

Signal-to-Noise Ratio (SNR)

1 kHz, −0.5 dBFS, sine wave input

Sinc5 filter

109

111

Wideband filter

106

107.8

Signal-to-Noise-and-Distortion

Ratio (SINAD)

1 kHz, −0.5 dBFS, sine wave input

104.7

107.5

Total Harmonic Distortion

(THD)

1 kHz, −0.5 dBFS, sine wave input

−120

−107

Spurious-Free Dynamic Range

(SFDR)

128

dBc

Median Mode

Decimation by 32, 128 kHz ODR

Dynamic Range

Shorted input, wideband filter

106.2

108

SNR

Sinc5 filter, 1 kHz, −0.5 dBFS, sine wave input

109

111

Wideband filter, 1 kHz, −0.5 dBFS, sine wave input

106

107.8

SINAD

1 kHz, −0.5 dBFS, sine wave input

105.8

107.5

THD

1 kHz, −0.5 dBFS, sine wave input

−120

−113

SFDR

128

dBc

Low Power Mode

Decimation by 32, 32 kHz ODR

Dynamic Range

Shorted input, wideband filter

106.2

108

SNR

Sinc5 filter, 1 kHz, −0.5 dBFS, sine wave input

109

111

Wideband filter, 1 kHz, −0.5 dBFS, sine wave input

106

107.8

SINAD

1 kHz, −0.5 dBFS, sine wave input

105.8

107.5

THD

1 kHz, −0.5 dBFS, sine wave input

−120

−113

SFDR

128

dBc

INTERMODULATON DISTORTION

(IMD)3

fINA = 9.7 kHz, fINB = 10.3 kHz

Second-order

−125

Third-order

−125

ACCURACY

INL

Endpoint method

±2

±7

ppm of FSR

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