ADS7828-Q1

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SBAS456B – DECEMBER 2008 – REVISED JANUARY 2016

6.4 Thermal Information

over operating free-air temperature range (unless otherwise noted)

ADS7828-Q1

THERMAL METRIC(1)

PW (TSSOP)

UNIT

16 PINS

RθJA

Junction-to-ambient thermal resistance

102.1

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

37.2

°C/W

RθJB

Junction-to-board thermal resistance

47.1

°C/W

ψJT

Junction-to-top characterization parameter

2.9

°C/W

ψJB

Junction-to-board characterization parameter

46.5

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

6.5 Electrical Characteristics for ADS7828E

+VDD = 2.7 V, VREF = 2.5 V, SCL clock frequency = 3.4 MHz (high-speed mode), over operating free-air temperature range,

unless otherwise noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analog Input

Ileak

Leakage current

±1

µA

CI

25

pF

Overall Performance

No missing codes

12

bits

Integral linearity error

±1

±2

LSB(1)

Differential linearity error

±1

LSB

Offset error

±1

±3

LSB

Offset error match

±0.2

±1

LSB

Gain error

±1

±4

LSB

Gain error match

±0.2

±1

LSB

Vn

Noise

RMS

33

µV

PSRR

Power-supply ripple rejection

82

dB

Sampling Dynamics

High-speed mode: SCL = 3.4 MHz

50

Throughput frequency

Fast mode: SCL = 400 kHz

8

kHz

Standard mode: SCL = 100 kHz

2

Conversion time

6

µs

AC Accuracy

THD

Total harmonic distortion(2)

VIN = 25 VPP at 10 kHz

–82

dB

Signal-to-noise ratio

VIN = 25 VPP at 10 kHz

72

dB

Signal-to-(noise + distortion) ratio

VIN = 25 VPP at 10 kHz

71

dB

Spurious-free dynamic range

VIN = 25 VPP at 10 kHz

86

dB

Channel-to-channel isolation

120

dB

Voltage Reference Output

VO

Output voltage

2.475

2.5

2.525

V

Internal reference drift

15

ppm/°C

Internal reference on

110

Ω

zo

Output impedance

Internal reference off

1

G

Ω

IQ

Quiescent current

850

µA

(1)

LSB means Least Significant Bit; with VREF equal to 2.5 V, one LSB is 610 µV.

(2)

THD is measured to the ninth harmonic.

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