THS1408 datasheet(5/22 Pages) TI

Part #	THS1408

Description	14-BIT, 1/3/8 MSPS DSP COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS WITH INTERNAL REFERENCE AND PGA

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Manufacturer	TI [Texas Instruments]

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THS1401, THS1403, THS1408

14-BIT, 1/3/8 MSPS DSP COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS

WITH INTERNAL REFERENCE AND PGA

SLAS248 – DECEMBER 1999

5

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

electrical characteristics (continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Reference Voltage

VBG

Bandgap voltage, internal mode

1.425

1.5

1.575

V

VBG

Input impedance

40

k

Ω

Positive reference voltage, REF+

2.5

V

Negative reference voltage, REF–

0.5

V

Reference difference,

∆REF, REF+ – REF–

2

V

Accuracy, internal reference

5%

Temperature coefficient

40

ppm/

°C

Voltage coefficient

200

ppm/V

Analog Inputs

Positive analog input, IN+

0

AVDD

V

Negative analog input, IN–

0

AVDD

V

Analog input voltage difference

∆Ain = IN+ – IN–, Vref = REF+ – REF–

–Vref

Vref

V

Input impedance

25

k

Ω

PGA range

0

7

dB

PGA step size

1

dB

PGA gain error

±0.25

dB

Digital Inputs

VIH

High-level digital input

2

V

VIL

Low-level digital input

0.8

V

Input capacitance

5

pF

Input current

±1

µA

Digital Outputs

VOH

High-level digital output

IOH = 50 µA

2.6

V

VOL

Low-level digital output

IOL = 50 µA

0.4

V

IOZ

Output current, high impedance

±10

µA

Clock Timing (CS low)

THS1401

0.1

1

MHz

fCLK

Clock frequency

THS1403

0.1

3

MHz

THS1408

0.1

8

MHz

td

Output delay time

25

ns

Latency

9.5

Cycles

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