ADS7846

3

SBAS125H

www.ti.com

ANALOG INPUT

Full-Scale Input Span

Positive Input-Negative Input

0

VREF

V

Absolute Input Range

Positive Input

–0.2

+VCC + 0.2

V

Negative Input

–0.2

+0.2

V

Capacitance

25

pF

Leakage Current

0.1

µA

SYSTEM PERFORMANCE

Resolution

12

Bits

No Missing Codes

11

Bits

Integral Linearity Error

±2

LSB(1)

Offset Error

±6LSB

Gain Error

External VREF

±4LSB

Noise

Including Internal VREF

70

µVrms

Power-Supply Rejection

70

dB

SAMPLING DYNAMICS

Conversion Time

12

CLK Cycles

Acquisition Time

3

CLK Cycles

Throughput Rate

125

kHz

Multiplexer Settling Time

500

ns

Aperture Delay

30

ns

Aperture Jitter

100

ps

Channel-to-Channel Isolation

VIN = 2.5Vp-p at 50kHz

100

dB

SWITCH DRIVERS

On-Resistance

Y+, X+

5

Ω

Y–, X–

6

Ω

Drive Current(2)

Duration 100ms

50

mA

REFERENCE OUTPUT

Internal Reference Voltage

2.45

2.50

2.55

V

Internal Reference Drift

15

ppm/

°C

Quiescent Current

500

µA

REFERENCE INPUT

Range

1.0

+VCC

V

Input Impedance

SER/DFR = 0, PD1 = 0,

1

G

Ω

Internal Reference Off

Internal Reference On

250

Ω

BATTERY MONITOR

Input Voltage Range

0.5

6.0

V

Input Impedance

Sampling Battery

10

k

Ω

Battery Monitor Off

1G

Ω

Accuracy

External VREF = 2.5V

–2+2

%

Internal Reference

–3+3

%

TEMPERATURE MEASUREMENT

Temperature Range

–40

+85

°C

Resolution

Differential Method(3)

1.6

°C

TEMP0(4)

0.3

°C

Accuracy

Differential Method(3)

±2

°C

TEMP0(4)

±3

°C

DIGITAL INPUT/OUTPUT

Logic Family

CMOS

Logic Levels, Except PENIRQ

VIH

| IIH | ≤ +5µA+VCC • 0.7

+VCC + 0.3

VIL

| IIL | ≤ +5µA

–0.3

+0.8

V

VOH

IOH = –250µA+VCC • 0.8

V

VOL

IOL = 250µA

0.4

V

PENIRQ

VOL

TA = 0°C to +85°C, 50kΩ Pull-Up

0.8

V

Data Format

Straight Binary

POWER-SUPPLY REQUIREMENTS

+VCC(5)

Specified Performance

2.7

3.6

V

Operating Range

2.2

5.25

V

Quiescent Current

Internal Reference Off

280

650

µA

Internal Reference On

780

µA

fSAMPLE = 12.5kHz

220

µA

Power-Down Mode with

3

µA

CS = DCLK = DIN = +VCC

Power Dissipation

+VCC = +2.7V

1.8

mW

TEMPERATURE RANGE

Specified Performance

–40

+85

°C

NOTES: (1) LSB means least significant bit. With VREF equal to +2.5V, one LSB is 610µV. (2) Ensured by design, but not tested. Exceeding 50mA source current

may result in device degradation. (3) Difference between TEMP0 and TEMP1 measurement. No calibration necessary. (4) Temperature drift is –2.1mV/

°C.

(5) ADS7846 operates down to 2.2V.

ADS7846E

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ELECTRICAL CHARACTERISTICS

At TA = –40°C to +85°C, +VCC = +2.7V, VREF = 2.5V internal voltage, fSAMPLE = 125kHz, fCLK = 16 • fSAMPLE = 2MHz, 12-bit mode, and digital inputs = GND or +VCC,

unless otherwise noted.