ETC5054 - ETC5057
PIN DESCRIPTION
Pin
N
N
°
°
Type DIP PLCC
Name
Function
Description
*
and
SO (**)
VBB
S
1
1
Negative
Power Supply
VBB = – 5V ± 5 %.
GNDA
VFRO
GND
O
2
3
2
3
Analog Ground
All signals are referenced to this pin.
Analog Output of the Receive Filter
Receive Filter
Output
VCC
FSR
S
I
4
5
5
6
Positive Power
Supply
VCC = + 5 V ± 5 %.
Receive Frame
Sync Pulse
Enables BCLKR to shift PCM data into DR. FSR is an
8kHz pulse train. See figures 1, 2 and 3 for timing
details.
DR
I
I
6
7
7
8
Receive Data
Input
PCM data is shifted into DR following the FSR leading
edge.
BCLKR/CLKSEL
Shift-in Clock
Shifts data into DR after the FSR leading edge. May
vary from 64 kHz to 2.048 MHz. Alternatively, may be
a logic input which selects either 1.536 MHz/1.544
MHz or 2.048 MHz for master clock in synchronous
mode and BCLKX is used for both transmit and receive
directions (see table 1). This input has an internal pull-
up.
MCLKR/PDN
I
8
9
Receive Master Clock Must be 1.536 MHz, 1.544 MHz or 2.048 MHz. May be
asynchronous with MCLKX, but should be
synchronous with MCLKX for best performance. When
MCLKR is connected continuously low, MCLKX is
selected for all internal timing. When MCLKR is
connected continuously high, the device is powered
down.
MCLKX
BCLKX
DX
I
9
12 Transmit Master Clock Must be 1.536 MHz, 1.544 MHz or 2.048 MHz. May be
asynchronous with MCLKR.
10
11
12
14
15
16
Shift-out Clock
Shifts out the PCM data on DX. May vary from 64 kHz
to 2.048 MHz, but must be synchronous with MCLKX.
I
O
I
Transmit
Data Output
The TRI-STATE PCM data output which is enabled
by FSX.
FSX
Transmit Frame
Sync Pulse
Enables BCLKX to shift out the PCM data on DX. FSX is
an 8 kHz pulse train. See figures 1, 2 and 3 for timing
details.
TSX
GSX
O
O
I
13
14
15
16
17
18
19
Transmit Time Slot
Gain Set
Open drain output which pulses low during the encoder
time slot. Recommended to be grounded if not used.
Analog output of the transmit input amplifier. Used to
set gain externally.
VFXI–
VFXI+
Inverting Amplifier
Input
Inverting Input of the Transmit Input Amplifier.
I
20 Non-inverting Amplifier Non-inverting Input of theTransmit Input Amplifier.
Input
(*) I: Input, O: Output, S: Power Supply
(**) Pins 4,10,11 and 13 are not connected
TRI-STATE is a trademark of National Semiconductor Corp.
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