AFE4490 datasheet(5/69 Pages) TI

5 / 69 page

AFE4400

www.ti.com

SBAS601D – DECEMBER 2012 – REVISED MAY 2013

ELECTRICAL CHARACTERISTICS (continued)

Minimum and maximum specifications are at TA = –20°C to +85°C. Typical specifications are at +25°C.

All specifications are at RX_ANA_SUP = RX_DIG_SUP = 3 V, TX_CTRL_SUP = LED_DRV_SUP = 3.3 V, and fCLK = 8 MHz,

unless otherwise noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

AMBIENT CANCELLATION STAGE

Gain

1, 1.414, 2, 2.828, and 4

V/V

Current DAC range

µA

Current DAC step size

µA

LOW-PASS FILTER

Low-pass corner frequency

3-dB attenuation

500

Duty cycle = 25%

0.004

Pass-band attenuation, 2 Hz to 10 Hz

Duty cycle = 10%

0.041

ANALOG-TO-DIGITAL CONVERTER

Resolution

Bits

See the ADC Operation and Averaging

Sample rate

4 × PRF

SPS

Module section

ADC full-scale voltage

±1.2

See the ADC Operation and Averaging

ADC conversion time

PRF / 4

µs

Module section

ADC reset time

tCLK

TRANSMITTER

Selectable, 0 to 50

Output current range

(see the LEDCNTRL: LED Control

LED current DAC error

±10%

Output current resolution

Bits

At 5-mA output current

Transmitter noise dynamic range,

At 25-mA output current

over 0.1-Hz to 5-Hz bandwidth

At 50-mA output current

At 50-mA output current,

1.4 + (voltage drop across LED,

H-bridge LED driver configuration

cable, and so forth) to 5.25

Voltage on TXP (or TXM) pin when low-side

switch connected to TXP (or TXM) turns on

At 50-mA output current,

1.3 + (voltage drop across LED,

common anode LED driver configuration

cable, and so forth) to 5.25

Minimum sample time of LED1 and LED2

µs

pulses

LED_ON = 0

µA

LED current DAC leakage current

LED_ON = 1

µA

LED current DAC linearity

Percent of full-scale current

0.5%

From zero current to 50 mA

µs

Output current settling time

(with resistive load)

From 50 mA to zero current

µs

DIAGNOSTICS

Start of diagnostics after the DIAG_EN

4k cycles

Duration of diagnostics state machine

of 4-MHz

End of diagnostic is indicated by DIAG_END

clock

going high.

Open fault resistance

> 100

Short fault resistance

< 10

INTERNAL OSCILLATOR

With an 8-MHz crystal connected to the XIN,

fCLKOUT

CLKOUT frequency

MHz

XOUT pins

CLKOUT duty cycle

50%

With an 8-MHz crystal connected to the XIN,

Crystal oscillator start-up time

200

µs

XOUT pins

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