ADS1198 datasheet(13/110 Pages) TI

13 / 110 page

ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R

www.ti.com

SBAS459K – JANUARY 2010 – REVISED AUGUST 2015

7.4 Thermal Information

ADS129x, ADS129xR

THERMAL METRIC(1)

PAG (TQFP)

ZXG (NFBGA)

UNIT

64 PINS

RθJA

Junction-to-ambient thermal resistance

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

°C/W

RθJB

Junction-to-board thermal resistance

°C/W

ψJT

Junction-to-top characterization parameter

0.1

0.5

°C/W

ψJB

Junction-to-board characterization parameter

N/A

°C/W

(1)

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

report, SPRA953.

7.5 Electrical Characteristics

Min and max specifications apply for all commercial grade (TA = 0°C to 70°C) devices, and from TA = –40°C to +85°C for

industrial-grade devices. Typical specifications at TA = 25°C. All specifications at DVDD = 1.8 V, AVDD – AVSS = 3 V

(1),

VREF = 2.4 V, external fCLK = 2.048 MHz, data rate = 500 SPS, HR mode

(2), and gain = 6 (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUTS

Input capacitance

TA = 25°C, input = 1.5 V

±200

Input bias current

TA = 0°C to 70°C, input = 1.5 V

±1

TA = –40°C to +85°C, input = 1.5 V

±1.2

No lead-off

1000

Ω

DC input impedance

Current source lead-off detection

500

Ω

Pullup resistor lead-off detection

Ω

PGA PERFORMANCE

Gain settings

1, 2, 3, 4, 6, 8, 12

Bandwidth

See Table 5

ADC PERFORMANCE

Data rates up to 8 kSPS, no missing codes

Bits

Resolution

16-kSPS data rate

Bits

32-kSPS data rate

Bits

fCLK = 2.048 MHz, HR mode

500

32000

SPS

Data rate

fCLK = 2.048 MHz, LP mode

250

16000

SPS

DC CHANNEL PERFORMANCE

Gain = 6(3), 10 seconds of data

μVPP

Input-referred noise

Gain = 6, 256 points, 0.5 seconds of data

μVPP

Gain settings

≠ 6, data rates≠ 500 SPS

See Noise Measurements section

Full-scale with gain = 6, best fit

ppm

Full-scale with gain = 6, best fit,

ppm

Integral nonlinearity(4)

ADS129xR channel 1

–20 dBFS with gain = 6, best fit,

ppm

ADS129xR channel 1

Offset error

±500

µV

Offset error drift

µV/°C

Gain error

Excluding voltage reference error

±0.2

±0.5

% of FS

Gain drift

Excluding voltage reference drift

ppm/°C

Gain match between channels

0.3

% of FS

(1)

Performance is applicable for 5-V operation as well. Production testing for limits is performed at 3 V.

(2)

LP mode = low-power mode.

(3)

Noise data measured in a 10-second interval. Test not performed in production. Input-referred noise is calculated with input shorted

(without electrode resistance) over a 10-second interval.

(4)

The presence of internal demodulation circuitry on channel 1 causes degradation of INL and THD. The effect is pronounced for full-scale

signals and is less for small ECG-type signals.

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Product Folder Links: ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R

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