Datasheet

AFE031
www.ti.com SBOS531D –AUGUST 2010–REVISED MAY 2012
ELECTRICAL CHARACTERISTICS: Two-Wire Interface
At T
J
= +25°C, PA_V
S
= 16 V, V
AVDD
= V
DVDD
= 3.3 V, and 10 kΩ connected to PA_ISET (pin 46), unless otherwise noted.
AFE031
PARAMETER CONDITIONS MIN TYP MAX UNIT
TWO-WIRE TRANSMITTER
Frequency range
(1)
50 kHz
Leakage input current
0 ≤ V
IN
≤ DV
DD
–1 0.01 1 μA
(E_Tx_In, E_Tx_Clk)
Input logic levels (E_Tx_In, E_Tx_Clk)
High-level input voltage V
IH
0.7 • DV
DD
V
Low-level input voltage V
IL
0.3 • DV
DD
V
Output logic levels (E_Tx_Out)
V
O
High-level output voltage I
OH
= 3 mA AV
DD
– 0.4 AV
DD
V
H
Low-level output voltage V
OL
I
OL
= –3 mA GND GND + 0.4 V
TWO-WIRE RECEIVER
Gain –4.5 dB
Frequency range 300 kHz
Max sink current 25 mA
Max source current 25 mA
Input terminal offset Referenced to V
AVDD
/2 –100 10 100 mV
Input impedance 78 kΩ
ZERO CROSSING DETECTOR
Input voltage range AV
DD
– 0.4 AV
DD
+ 0.4 V
Input current range –10 +10 mA
Input capacitance 3 pF
Rising threshold 0.45 0.9 1.35 V
Falling threshold 0.25 0.5 0.75 V
Hysteresis 0.20 0.4 0.60 V
Jitter 50 Hz, 240 V
RMS
10 ns
(1) The two-wire transmitter circuit is tested at Tx_CLK = 10 MHz.
ELECTRICAL CHARACTERISTICS: Internal Bias Generator
At T
J
= +25°C, PA_V
S
= 16 V, V
AVDD
= V
DVDD
= 3.3 V, and 10 kΩ connected to PA_ISET (pin 46), unless otherwise noted.
AFE031
PARAMETER CONDITIONS MIN TYP MAX UNIT
REF1 (Pin 19)
Bias voltage PA_V
S
/2 V
Input resistance R
I
4 kΩ
Noise-reducing capacitor = 1 nF from
Turn-on time 20 ms
pin 19 to ground
Noise-reducing capacitor = 1 nF from
Turn-off time 20 ms
pin 19 to ground
REF2 (Pin 28)
Bias voltage V
AVDD
/2 V
Input resistance R
I
4 kΩ
Noise-reducing capacitor = 1 μF from
Turn-on time 20 ms
pin 28 to ground
Noise-reducing capacitor = 1 μF from
Turn-off time 20 ms
pin 28 to ground
Copyright © 2010–2012, Texas Instruments Incorporated 9
Product Folder Link(s): AFE031