AFE4490 datasheet(4/69 Pages) TI

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AFE4400

SBAS601D – DECEMBER 2012 – REVISED MAY 2013

www.ti.com

ELECTRICAL CHARACTERISTICS

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

PERFORMANCE (Full-Signal Chain)

RF = 10 kΩ

µA

RF = 25 kΩ

µA

RF = 50 kΩ

µA

IIN_FS

Full-scale input current

RF = 100 kΩ

µA

RF = 250 kΩ

µA

RF = 500 kΩ

µA

RF = 1 MΩ

0.5

µA

PRF

Pulse repetition frequency

5000

SPS

DCPRF

PRF duty cycle

25%

RF = 10 kΩ

µA

IIN_FS

Full-scale input current

RF = 1 MΩ

0.5

µA

fCM = 50 Hz and 60 Hz, LED1 and LED2 with

RSERIES = 1 MΩ, RF = 500 kΩ

CMRR

Common-mode rejection ratio

fCM = 50 Hz and 60 Hz, LED1-AMB and

LED2-AMB with RSERIES = 1 MΩ,

100

RF = 500 kΩ

fPS = 50 Hz, 60 Hz at PRF = 200 Hz

100

PSRR

Power-supply rejection ratio

fPS = 50 Hz, 60 Hz at PRF = 600 Hz

106

PSRRLED

PSRR, transmit LED driver

With respect to ripple on LED_DRV_SUP

PSRRTx

PSRR, transmit control

With respect to ripple on TX_CTRL_SUP

With respect to ripple on RX_ANA_SUP and

PSRRRx

PSRR, receiver

RX_DIG_SUP

Total integrated noise current, input-referred

RF = 100 kΩ, PRF = 625 Hz, duty cycle = 5%

pARMS

(receiver with transmitter loop back,

RF = 500 kΩ, PRF = 625 Hz, duty cycle = 5%

pARMS

0.1-Hz to 5-Hz bandwidth)

RF = 100 kΩ, PRF = 625 Hz, duty cycle = 5%

14.3

Bits

Noise-free bits (receiver with transmitter loop

NFB

back, 0.1-Hz to 5-Hz bandwidth)

RF = 500 kΩ, PRF = 625 Hz, duty cycle = 5%

13.5

Bits

RECEIVER FUNCTIONAL BLOCK LEVEL SPECIFICATION

RF = 500 kΩ, ambient cancellation enabled,

stage 2 gain = 4, PRF = 1300 Hz,

1.4

pARMS

LED duty cycle = 25%

Total integrated noise current, input referred

(receiver alone) over 0.1-Hz to 5-Hz bandwidth

RF = 500 kΩ, ambient cancellation enabled,

stage 2 gain = 4, PRF = 1300 Hz,

pARMS

LED duty cycle = 5%

I-V TRANSIMPEDANCE AMPLIFIER

See the Receiver Channel section

Gain

RF = 10 kΩ to 1 MΩ

V/µA

for details

Gain accuracy

±7%

10k, 25k, 50k, 100k, 250k,

Feedback resistance

500k, and 1M

Feedback resistor tolerance

±20%

Feedback capacitance

5, 10, 25, 50, 100, and 250

Feedback capacitor tolerance

±20%

Full-scale differential output voltage

Common-mode voltage on input pins

Set internally

0.9

Includes equivalent capacitance of

External differential input capacitance

1000

photodiode, cables, EMI filter, and so forth

With a 1-k

Ω series resistor and a 10-nF

Shield output voltage, VCM

0.9

decoupling capacitor to ground

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