ADS8422IBPFBTG4 datasheet(4/29 Pages) TI1

Part #	ADS8422IBPFBTG4

Description	16-BIT, 4-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE

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SPECIFICATIONS (Continued)

ADS8422

SLAS512B – JUNE 2006 – REVISED DECEMBER 2006

T

A = –40°C to 85°C, +VA = 5 V, +VAREG = 5.25 V to 3 V, +VBD = 5 V to 2.7 V, fSAMPLE = 4 MSPS, Vref = 4.096 V (measured

with internal reference buffer) (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DYNAMIC CHARACTERISTICS

10 kHz

–114

Total harmonic distortion (THD)(1)

VIN = 8 Vpp

100 kHz

–102

dB

500 kHz

–100

10 kHz

93

Signal to noise ratio (SNR)

VIN = 8 Vpp

100 kHz

92

dB

500 kHz

90

10 kHz

92.5

Signal to noise + distortion (SINAD)

VIN = 8 Vpp

100 kHz

91.5

dB

500 kHz

89.5

10 kHz

116

Spurious free dynamic range (SFDR)

VIN = 8 Vpp

100 kHz

109

dB

500 kHz

106

–3dB Small signal bandwidth

30

MHz

Maximum input frequency, fi(max)(2)

VIN = 8 Vpp

2

MHz

VOLTAGE REFERENCE INPUT

Reference voltage at REFIN, Vref

3.9

4.096

4.15

V

Reference resistance

1000

M

Ω

INTERNAL REFERENCE OUTPUT

Internal reference start-up time

From 95% (+VA), with 1-

µF capacitor on REFOUT

25

ms

Reference voltage range, Vref

IO = 0, TA = 25°C

4.088

4.096

4.104

V

Source current

Static load

10

µA

Line regulation

+VA = 4.75 V to 5.25 V

±1

mV

Drift

IO = 0

±6

PPM/

°C

ANALOG COMMON-MODE, PIN 3

Output voltage range

IO = 0

VREF/2 - 0.016

VREF/2

VREF/2 + 0.016

V

Source current

Static load

200

µA

(1)

Calculated on the first nine harmonics of the input frequency.

(2)

ADC Sampling circuit is optimized to accept inputs until Nyquist frequency. Dynamic performance may degrade rapidly above fi(max).

4

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