Texas Instruments TCM29C16N, TCM29C16DW, TCM129C16N, TCM29C17N, TCM29C17DW Datasheet

TCM29C13, TCM29C14, TCM29C16, TCM29C17, TCM129C13, TCM129C14, TCM129C16, TCM129C17 COMBINED SINGLE-CHIP PCM CODEC AND FILTER

SCTS011H ± APRIL 1986 ± REVISED JULY 1996

DReplaces Use of TCM2910A in Tandem With TCM2912C

DReliable Silicon-Gate CMOS Technology

DLow Power Consumption:

Operating Mode . . . 80 mW Typical

Power-Down Mode . . . 5 mW Typical

DExcellent Power-Supply Rejection Ratio Over Frequency Range of 0 Hz to 50 kHz

DNo External Components Needed for Sample, Hold, and Autozero Functions

DPrecision Internal Voltage References

DDirect Replacement for Intel 2913, 2914, 2916, and 2917

DRecommended for Direct Voice Applications

FEATURES TABLE

	FEATURE	29C13	29C14	29C16	29C17
		129C13	129C14	129C16	129C17
	Number of Pins:
	24		X
	20	X
	16			X	X
	μ-Law/A-Law Coding:
	μ-Law	X	X	X
	A-Law	X	X		X
	Gain Timing Rates:
	Variable Mode
	64 kHz to 2.048 MHz	X	X	X	X
	Fixed Mode
	1.536 MHz	X	X
	1.544 MHz	X	X
	2.048 MHz	X	X	X	X
	Loopback Test Capability		X
	8th-Bit Signaling		X

description

The TCM29C13, TCM29C14, TCM29C16,

TCM29C17, TCM129C13, TCM129C14, TCM129C16, and TCM129C17 are single-chip PCM codecs (pulse-code-modulated encoders and decoders) and PCM line filters. They provide all the functions required to interface a full-duplex (4-wire) voice telephone circuit with a TDM (time-division-multiplexed) system, and are intended to replace the TCM2910A in tandem with the TCM2912C. Primary applications include:

•Line interface for digital transmission and switching of T1 carrier, PABX, and central office telephone systems

•Subscriber line concentrators

•Digital-encryption systems

•Digital voice-band data-storage systems

•Digital signal processing

TCM29C13, TCM129C13									TCM29C14, TCM129C14									TCM29C16, TCM29C17,
	DW OR N PACKAGE									DW PACKAGE								TCM129C16, TLC129C17
			(TOP VIEW)									(TOP VIEW)							DW OR N PACKAGE
										VBB						VCC					(TOP VIEW)
	VBB			1	20		VCC						1	24
PWRO +				2	19		GSX		PWRO +				2	23		GSX			VBB			1	16		VCC
									PWRO ±							ANLG IN ±
PWRO ±				3	18		ANLG IN ±						3	22				PWRO +				2	15		GSX
									GSR							ANLG IN +
GSR				4	17		ANLG IN +						4	21				PWRO ±				3	14		ANLG IN ±
																ANLG GND
										PDN			5	20
	PDN			5	16		ANLG GND												PDN			4	13		ANLG GND
									CLKSEL							NC
				6	15								6	19								5	12
CLKSEL							SIGX/ASEL											DCLKR							TSX/DCLKX
									ANLG LOOP				7	18		SIGX/ASEL
				7	14													PCM IN				6	11		PCM OUT
DCLKR							TSX/DCLKX
PCM IN				8	13		PCM OUT		SIGR				8	17		TSX/DCLKX		FSR/TSRE				7	10		FSX/TSXE
									DCLKR						PCM OUT
FSR/TSRE				9	12		FSX/TSXE						9	16				DGTL GND				8	9		CLKR/CLKX
DGTL GND				10	11		CLKR/CLKX		PCM IN				10	15	FSX/TSXE
									FSR/TSRE				11	14	CLKX
									DGTL GND				12	13	CLKR

NC ± No internal connection

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright 1996, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

1

TCM29C13, TCM29C14, TCM29C16, TCM29C17,

TCM129C13, TCM129C14, TCM129C16, TCM129C17

COMBINED SINGLE-CHIP PCM CODEC AND FILTER

SCTS011H ± APRIL 1986 ± REVISED JULY 1996

description (continued)

These devices are designed to perform the transmit encoding (A/D conversion) and receive decoding (D/A conversion) as well as the transmit and receive filtering functions in a pulse-code-modulated system. They are intended to be used at the analog termination of a PCM line or trunk.

The TCM129C13, TCM129C14, TCM129C16, TCM129C17, TCM29C13, TCM29C14, TCM29C16, and TCM29C17 provide the band-pass filtering of the analog signals prior to encoding and after decoding. These combination devices perform the encoding and decoding of voice and call progress tones as well as the signaling and supervision information.

The TCM29C13, TCM29C14, TCM29C16, and TCM29C17 are characterized for operation from 0°C to 70°C. The TCM129C13, TCM129C14, TCM129C16, and TCM129C17 are characterized for operation from ±40°C to 85°C.

functional block diagram

	Transmit Section
ANLG IN+	Filter
ANLG IN ±
GSX

		Autozero
	Sample				PCM OUT
			Successive	Output
	and Hold	Comparator			TSX/DCLKX
			Approximation	Register
	and DAC
					SIGX/ASEL

		Analog-
	Reference	to-Digital	FSX/TSXE
		Control
			CLKX
		Logic

		Receive Section	Control		CLKSEL
		Filter	Section	Control	PDN
			³	Logic
		Gain			ANLG
	GSR
		Set			LOOP²
		Buffer
	PWRO ±	Sample	Digital-	Input	PCM IN
			to-Analog
		and Hold
			Control	Register
		and DAC			DCLKR
			Logic

PWRO+	Reference		SIGR²
			FSR/TSRE
	VCC VBB DGTL	ANLG	CLKR²
	GND	GND

² TCM29C14 and TCM129C14 only

³ TCM29C13, TCM29C16, TCM29C17, TCM129C13, TCM129C16, and TCM129C17 only

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TCM29C13, TCM29C14, TCM29C16, TCM29C17,

TCM129C13, TCM129C14, TCM129C16, TCM129C17

COMBINED SINGLE-CHIP PCM CODEC AND FILTER

					SCTS011H ± APRIL 1986 ± REVISED JULY 1996
			Terminal Functions
	TERMINAL NO.
			TCM29C16	I/O	DESCRIPTION
NAME	TCM29C13	TCM29C14	TCM29C17
	TCM129C13	TCM129C14	TCM129C16
			TCM129C17
ANLG GND	16	20	13		Analog ground return for all internal voice circuits. Not internally
					connected to DGTL GND.
ANLG IN +	17	21		I	Noninverting analog input to uncommitted transmit operational amplifier.
					Internally connected to ANLG GND on TCM129C16, TCM29C16,
					TCM129C17, and TCM29C17.
ANLG IN ±	18	22	14	I	Inverting analog input to uncommitted transmit operational amplifier.
ANLG LOOP		7		I	Provides loopback test capability. When this input is high, PWRO + is
					internally connected to ANLG IN.
CLKR	11	13	9	I	Receive master clock and data clock for the fixed-data-rate mode.
					Receive master clock only for variable-data-rate mode. CLKR and CLKX
					are internally connected together for TCM129C13, TCM129C16,
					TCM129C17, TCM29C13, TCM29C16, and TCM29C17.
CLKSEL	6	6		I	Clock-frequency selection. Input must be connected to VBB, VCC, or
					ground to reflect the master-clock frequency. When tied to VBB, CLK is
					2.048 MHz. When tied to GND, CLK is 1.544 MHz. When tied to VCC,
					CLK is 1.536 MHz.
CLKX	11	14	9	I	Transmit master clock and data clock for the fixed-data-rate mode.
					Transmit master clock only for variable-date-rate mode. CLKR and
					CLKX are internally connected for the TCM129C13, TCM129C16,
					TCM129C17, TCM29C13, TCM29C16, and TCM29C17.
DCLKR	7	9	5	I	Fixed or variable-data-rate operation select. When connected to VBB,
					the device operates in the fixed-data-rate mode. When DCLKR is not
					connected to VBB, the device operates in the variable-data-rate mode,
					and DCLKR becomes the receiver data clock. DCLKR then operates at
					frequencies from 64 kHz to 2.048 MHz.
DGTL GND	10	12	8		Digital ground for all internal logic circuits. Not internally connected to
					ANLG GND.
FSR/TSRE	9	11	7	I	Frame synchronization clock input/time-slot enable for receive channel.
					In the fixed-data-rate mode, FSR distinguishes between signaling and
					nonsignaling frames by a doubleor single-length pulse, respectively. In
					the variable-data-rate mode, this signal must remain high for the duration
					of the time slot. The receive channel enters the standby state when FSR
					is TTL low for 300 ms.
FSX/TSXE	12	15	10	I	Frame-synchronization clock input/time-slot enable for transmit
					channel. Operates independently of, but in an analagous manner to,
					FSR/TSRE. The transmit channel enters the standby state when FSX is
					low for 300 ms.
GSR	4	4		I	Input to the gain-setting network on the output power amplifier.
					Transmission level can be adjusted over a 12-dB range depending on the
					voltage at GSR.
GSX	19	23	15	O	Output terminal of internal uncommitted operational amplifier. Internally,
					this is the voice signal input to the transmit filter.
PCM IN	8	10	6	I	Receive PCM input. PCM data is clocked in on eight consecutive
					negative transitions of the receive data clock, which is CLKR in
					fixed-data-rate timing and DCLKR in variable-data-rate timing.
PCM OUT	13	16	11	O	Transmit PCM output. PCM data is clocked out on this output on eight
					consecutive positive transitions of the transmit data clock, which is CLKX
					in fixed-data-rate timing and DCLKX in variable-data-rate timing.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

3

TCM29C13, TCM29C14, TCM29C16, TCM29C17,

TCM129C13, TCM129C14, TCM129C16, TCM129C17

COMBINED SINGLE-CHIP PCM CODEC AND FILTER

SCTS011H ± APRIL 1986 ± REVISED JULY 1996

Terminal Functions

					TERMINAL NO.
							TCM29C16	I/O	DESCRIPTION
	NAME				TCM29C13	TCM29C14	TCM29C17
					TCM129C13	TCM129C14	TCM129C16
							TCM129C17
					5	5	4	I	Power-down select. The device is inactive with a TTL low-level input to
		PDN
									this terminal and active with a TTL high-level input to the terminal.
	PWRO +				2	2	2	O	Noninverting output of power amplifier. Can drive transformer hybrids or
									high-impedance loads directly in either a differential or a single-ended
									configuration
	PWRO ±				3	3	3	O	Inverting output of power amplifier. Functionally identical with and
									complementary to PWRO +.
	SIGR					8		O	Signaling bit output, receive channel. In a fixed-data-rate mode, outputs
									the logical state of the 8th bit (LSB) of the PCM word in the most recent
									signaling frame.
	SIGX/ASEL				15	18		I	A-law and μ-law operation select. When connected to VBB, A-law is
									selected. When connected to VCC or GND, μ-law is selected. When not
									connected to VBB, a TTL-level input is transmitted as the eighth bit (LBS)
									of the PCM word during signaling frames on PCM OUT (TCM29C14 and
									TCM129C14 only). SIGX/ASEL is internally connected to provide μ-law
									operational for TCM29C16 and TCM129C16 and A-law operation for
									TCM29C17 and TCM129C17.
					14	17	12	I/O	Transmit channel time-slot strobe (output) or data clock (input) for the
	TSX/DCLKX
									transmit channel. In the fixed-data-rate mode, this terminal is an
									open-drain output to be used as an enable signal for a 3-state output
									buffer. In the variable-data rate mode, DCLKX becomes the transmit
									data clock, which operates at TTL level from 64 kHz to 2.048 MHz.
		VBB			1	1	1		Most negative supply voltage. Input is ± 5 V ± 5%.
		VCC			20	24	16		Most positive supply voltage. Input is 5 V ± 5%

4	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TCM29C13, TCM29C14, TCM29C16, TCM29C17,

TCM129C13, TCM129C14, TCM129C16, TCM129C17

COMBINED SINGLE-CHIP PCM CODEC AND FILTER

SCTS011H ± APRIL 1986 ± REVISED JULY 1996

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)²

Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. ±0.3 V to 15 V
Output voltage range, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. ±0.3 V to 15 V
Input voltage range, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. ±0.3 V to 15 V
Digital ground voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	±0.3 V to 15 V
Continuous total dissipation at (or below) 25°C free-air temperature . . . . . . . . . . . . . . . . . . . . .	. . . . 1375 mW
Operating free-air temperature range, TA: TCM29Cxx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . 0°C to 70°C
TCM129Cxx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	±40°C to 85°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	±65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: DW or N package . . . . . . .	. . . . . . . 260°C

²Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: Voltage values for maximum ratings are with respect to VBB.

recommended operating conditions (see Note 2)

		MIN	NOM	MAX	UNIT
Supply voltage, VCC (see Note 3)		4.75	5	5.25	V
Supply voltage, VBB		± 4.75	± 5	± 5.25	V
Digital ground voltage with respect to ANGL GND			0		V
High-level input voltage, VIH (all inputs except CLKSEL)		2.2			V
Low-level input voltage, VIL (all inputs except CLKSEL)				0.8	V
	2.048 MHz	VBB		VBB + 0.5
Clock-select input voltage	1.544 MHz	0		0.5	V
	1.536 MHz	VCC ± 0.5		VCC
Load resistance, RL	GSX	10			kΩ
	PWRO + and/or PWRO ±	300			Ω
Load capacitance, CL	GSX			50	pF
	PWRO + and/or PWRO ±			100
Operating free-air temperature, TA	TCM29Cxx	0		70	°C
	TCM129Cxx	± 40		85

NOTES: 2. To avoid possible damage to these CMOS devices and resulting reliability problems, the power-up procedure described in the device power-up sequence paragraphs later in this document should be followed.

3.Voltage at analog inputs and outputs, VCC and VBB terminals, are with respect to the ANLG GND terminal. All other voltages are referenced to the digital ground terminal unless otherwise noted.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

5

TCM29C13, TCM29C14, TCM29C16, TCM29C17,

TCM129C13, TCM129C14, TCM129C16, TCM129C17

COMBINED SINGLE-CHIP PCM CODEC AND FILTER

SCTS011H ± APRIL 1986 ± REVISED JULY 1996

electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)

supply current, fDCLK = 2.048 MHz, outputs not loaded

PARAMETER

TEST CONDITIONS

TCM29Cxx

TCM129Cxx

UNIT

MIN

TYP²

MAX

MIN TYP²

MAX

Supply current

Operating

7

9

8

13

ICC

Standby

FSX, FSR = VIL after 300 ms

0.5

1

0.7

1.5

mA

from VCC

Power down

PDN = VIL after 10 μs

0.3

0.8

0.4

1

Supply current

Operating

± 7

± 9

± 8

± 13

IBB

Standby

FSX, FSR = VIL after 300 ms

± 0.5

± 1

± 0.7

± 1.5

mA

from VBB

Power down

PDN = VIL after 10 μs

± 0.3

± 0.8

± 0.4

± 1

Operating

70

90

80

130

PD

Power dissipation

mW

Standby

FSX, FSR = VIL after 300 ms

5

10

7

15

Power down

= VIL after 10 μs

3

8

4

10

PDN

² All typical values are at V

BB

= ± 5 V, V = 5 V, and T = 25°C.

CC

A

digital interface

	PARAMETER		TEST CONDITIONS	TCM29Cxx		TCM129Cxx		UNIT
				MIN TYP²	MAX	MIN TYP²	MAX
VOH	High-level output voltage	PCM OUT	IOH = ± 9.6 mA	2.4		2.4		V
		SIGR	IOH = ± 1.2 mA	2.4		2.4
VOL	Low-level output voltage at PCM OUT,		IOL = 3.2 mA		0.4		0.5	V
	TSX, SIGR
IIH	High-level input current, any digital input		VI = 2.2 V to VCC		10		12	μA
IIL	Low-level input current, any digital input		VI = 0 to 0.8 V		10		12	μA
Ci	Input capacitance			5	10	5	10	pF
Co	Output capacitance			5		5		pF

² All typical values are at VBB = ± 5 V, VCC = 5 V, and TA = 25°C.

transmit amplifier input

PARAMETER				TEST CONDITIONS	MIN TYP² MAX	UNIT
Input current at ANLG IN +, ANLG IN ±					± 100	nA
Input offset voltage at ANLG IN +, ANLG IN ±				VI = ± 2.17 V to 2.17 V	± 25	mV
Common-mode rejection at ANLG IN +, ANLG IN ±					55	dB
Open-loop voltage amplification at GSX					5000
Open-loop unity-gain bandwidth at GSX					1	MHz
Input current at ANLG IN +, ANLG IN ±					10	MΩ
² All typical values are at V	BB	= ± 5 V, V	= 5 V, and T	= 25°C.
		CC	A

receive filter output

PARAMETER				TEST CONDITIONS	MIN TYP²	MAX	UNIT
Output offset voltage PWRO+, PWRO ± (single ended)				Relative to ANLG GND	80	180	mV
Output resistance at PWRO+, PWRO ±					1		Ω
² All typical values are at V	BB	= ± 5 V, V	= 5 V, and T	= 25°C.
		CC	A

6	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TCM29C13, TCM29C14, TCM29C16, TCM29C17,

TCM129C13, TCM129C14, TCM129C16, TCM129C17

COMBINED SINGLE-CHIP PCM CODEC AND FILTER

SCTS011H ± APRIL 1986 ± REVISED JULY 1996

gain and dynamic range, VCC = 5 V, VBB = 5 V, TA = 25°C (unless otherwise noted)

(see Notes 4, 5, and 6)

PARAMETER		TEST CONDITIONS		MIN TYP	MAX	UNIT
Encoder milliwatt response (transmit gain tolerance)		Signal input = 1.064 Vrms for μ-law,		± 0.04	± 0.02	dBm0
		Signal input = 1.068 Vrms for A-law
Encoder milliwatt response additional tolerance		TA = 0°C to 70°C,	Supplies = ± 5%		± 0.08	dB
(nominal supplies and temperature)
Digital milliwatt response (receive tolerance gain)		Signal input per CCITT G.711,		± 0.04	± 0.02	dBm0
relative to zero-transmission-level point		Output signal = 1 kHz
Digital milliwatt response variation with temperature		TA = 0°C to 70°C,	Supplies = ± 5%		± 0.08	dB
and supplies
	μ-law	RL = 600 Ω		2.76
Zero-transmission-level point, transmit channel	A-law			2.79		dBm
(0 dBm0)	μ-law	RL = 900 Ω		1
	A-law			1.03
	μ-law	RL = 600 Ω		5.76
Zero-transmission-level point, receive channel	A-law			5.79		dBm
(0 dBm0)	μ-law	RL = 900 Ω		4
	A-law			4.03

NOTES: 4. Unless otherwise noted, the analog input is a 0-dBm0, 1020-Hz sine wave, where 0 dBm0 is defined as the zero-reference point of the channel under test. This corresponds to an analog signal input of 1.064 Vrms or an output of 1.503 Vrms.

5.The input amplifier is set for noninverting unity gain. The digital input is a PCM bit stream generated by passing a 0-dBm0, 1020-Hz sine wave through an ideal encoder.

6.Receive output is measured single ended in the maximum gain configuration. To set the output amplifier for maximum gain, GSR is connected to PWRO ± and the output is taken at PWRO+. All output levels are (sin x)/x corrected.

gain tracking over recommended ranges of supply voltage and operating free-air temperature, reference level = ±10 dBm0

PARAMETER		TEST CONDITIONS		MIN MAX	UNIT
	3	≥ input level ≥	± 40 dBm0	± 0.25
Transmit gain-tracking error, sinusoidal input	± 40 > input level ≥		± 50 dBm0	± 0.5	dB
	± 50 > input level ≥		± 55 dBm0	± 1.2
	3	≥ input level ≥	± 40 dBm0	± 0.25
Receive gain-tracking error, sinusoidal input	± 40 > input level ≥		± 50 dBm0	± 0.5	dB
	± 50	> input level ≥	± 55 dBm0	± 1.2

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

7

TCM29C13, TCM29C14, TCM29C16, TCM29C17,

TCM129C13, TCM129C14, TCM129C16, TCM129C17

COMBINED SINGLE-CHIP PCM CODEC AND FILTER

SCTS011H ± APRIL 1986 ± REVISED JULY 1996

noise over recommended ranges of supply voltage and operating free-air temperature range

PARAMETER	TEST CONDITIONS		MIN MAX	UNIT
Transmit noise, C-message weighted	ANLG IN+ = ANLG GND,	ANLG IN ± = GSX	15	dBrnC0
Transmit noise, C-message weighted with 8-bit-	ANLG IN+ = ANLG GND,	ANLG IN ± = GSX,	18	dBrnC0
signaling (TCM29C14 and TCM129C14 only)	6th frame signaling
Transmit noise, psophometrically weighted	ANLG IN+ = ANLG GND,	ANLG IN ± = GSX	± 6 9	dBm0p
Receive noise, C-message-weighted quiet code	PCM IN = 11111111 (μ-law),	PCM IN = 10101010	11	dBrnC0
	(A-law), measured at PWRO +
Receive noise, C-message-weighted sign bit toggled	Input to PCM IN is zero code with sign bit toggled at		12	dBrmC0
	1-kHz rate
Receive noise, psophometrically weighted	PCM = lowest positive decode level		± 79	dBm0p

power-supply rejection ratio and crosstalk attenuation over recommended ranges of supply voltage and operating free-air temperature

PARAMETER			TEST CONDITIONS		MIN	TYP² MAX	UNIT
VCC supply-voltage rejection ratio,	0 ≤ f < 30 kHz		Idle channel,			± 30
			Supply signal = 200 mV(peak-to-peak),				dB
transmit channel	30	≤ f < 50 kHz				± 45
			f measured at PCM OUT
VBB supply-voltage rejection ratio,	0 ≤ f < 30 kHz		Idle channel,			± 30
			Supply signal = 200 mV(peak-to-peak),				dB
transmit channel	30	≤ f < 50 kHz				± 55
			f measured at PCM OUT
VCC supply-voltage rejection ratio,	0 ≤ f < 30 kHz		Idle channel,			± 20
			Supply signal = 200 mV(peak-to-peak),				dB
receive channel (single ended)	30	≤ f < 50 kHz				± 45
			f measured at PWRO +
VBB supply-voltage rejection ratio,	0 ≤ f < 30 kHz		Idle channel,			± 20
			Supply signal = 200 mV(peak-to-peak),				dB
receive channel (single ended)	30	≤ f < 50 kHz				± 45
			Narrow band,	f measured at PWRO +
			ANLG IN+ = 0 dBm0,	f = 1.02 kHz,
Crosstalk attenuation, transmit to receive			Unity gain,		71		dB
(single ended)			PCM IN = lowest decode level,
			Measured at PWRO+
Crosstalk attenuation, receive to transmit			PCM IN = 0 dBm0,	f = 1.02 kHz,	71		dB
(single ended)			Measured at PCM OUT

² All typical values are at VBB = ± 5 V, VCC = 5 V, and TA = 25°C.

8	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265