ia3211 integration, ia3211 Datasheet - Page 7

• Manufacturer Part Number: ia3211
• Description: Optical Silicon Daa Modem/lineside Chipset
• Manufacturer: integration

PACKAGE PIN DEFINITIONS
Pin type key: D=digital, A=analog, S=supply, I=input, O=output, IO=input/output
IA3211
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
ONHKML
AUDOUT
OFFHKL
ONHKM
TXBIAS
RXOUT
SRVAN
SRVCT
TXAMP
ACREF
OFFHK
LEDCT
AUDIN
LSTAT
RXAN
Name
VREF
RXCT
N.C.1
RNG
C1B
Vdd
Vss
C2
Type
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
P
P
I
I
I
I
I
I
I
I
Function
Receive optical active bias time constant capacitor (15nF to C1A).
Internal band-gap voltage reference (do not load over 1µA).
Optical active bias circuit low-pass filter integrator response capacitor (68nF to ground).
Rx cathode – Receiver photo diode return.
Rx anode – Receiver photo diode input.
PCB layout must minimize pickup from other signal sources.
Active low on-hook monitor input (internal pull-up resistor)
Active high on-hook monitor input (internal pull-down resistor)
Not connected (HIN).
Servo Anode – Transmit servo photo diode input.
PCB layout must minimize pickup from other signal sources.
Servo cathode – Transmit servo photo diode current return (clamped @ 0.8V).
Tx amplifier input biased to ACREF.
A 120K resistor in series with the audio source provides 0dB gain to the phone line.
Power supply voltage 3.0 to 7.0 V.
LED cathode. Transmit linear optocoupler LED cathode.
PCB layout must minimize pickup from other signal sources.
Power supply return (Ground).
Auxiliary amplifier output - will drive a 300Ω load.
Inverting input for an auxiliary amplifier. The non-inverting input is internally tied to ACREF.
Transmit DC bias point setting (25.5kΩ 1% to ground).
Internal transmit and receive audio voltage reference (1.25V @ 1µA).
Can be overdriven by external source.
Audio output biased to ACREF. Provides 6dB attenuation from the phone line and has a 300Ω
driving capability.
Active high off-hook control input (internal pull-down resistor).
Active low off-hook control input (internal pull-up resistor).
Ring detection output. A 4ms wide pulse is generated for each full or half ring cycle depending
on the HLFWV pin of the IA3212 while in idle mode. In on-hook monitor and off-hook modes,
RNG follows LSTAT.
Line status – Line in use and parallel pick-up detection.
In idle mode, LSTAT provides a V/F transfer function from the phone line voltage. In on-hook
monitor and off-hook modes, LSTAT outputs a single pulse if the line current is suddenly
decreased.
IA2311
IA2312
IA3211 & IA3212
7