AD7768BSTZ datasheet(6/99 Pages) AD

6 / 99 page

AD7768/AD7768-4

Data Sheet

Rev. A | Page 6 of 99

SPECIFICATIONS

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, 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

256

kSPS

Median

128

kSPS

Eco

kSPS

−3 dB Bandwidth

Fast, wideband filter

110.8

kHz

Median, wideband filter

55.4

kHz

Eco, wideband filter

13.8

kHz

Data Output Coding

Twos complement, MSB first

No Missing Codes2

Bits

DYNAMIC PERFORMANCE

For 1.8 V operation, see Table 2; for

dynamic range and SNR across all dec-

imation rates, see Table 12 and Table 13

Fast

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

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

Eco

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

fa = 9.7 kHz, fb = 10.3 kHz

Second order

−125

Third order

−125

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