ADS8422IPFBT datasheet(4/29 Pages) TI1

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SPECIFICATIONS (Continued)

ADS8422

SLAS512B – JUNE 2006 – REVISED DECEMBER 2006

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

500 kHz

–100

10 kHz

Signal to noise ratio (SNR)

VIN = 8 Vpp

100 kHz

500 kHz

10 kHz

92.5

Signal to noise + distortion (SINAD)

VIN = 8 Vpp

100 kHz

91.5

500 kHz

89.5

10 kHz

116

Spurious free dynamic range (SFDR)

VIN = 8 Vpp

100 kHz

109

500 kHz

106

–3dB Small signal bandwidth

MHz

Maximum input frequency, fi(max)(2)

VIN = 8 Vpp

MHz

VOLTAGE REFERENCE INPUT

Reference voltage at REFIN, Vref

3.9

4.096

4.15

Reference resistance

1000

Ω

INTERNAL REFERENCE OUTPUT

Internal reference start-up time

From 95% (+VA), with 1-

µF capacitor on REFOUT

Reference voltage range, Vref

IO = 0, TA = 25°C

4.088

4.096

4.104

Source current

Static load

µA

Line regulation

+VA = 4.75 V to 5.25 V

±1

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

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).

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