Texas Instruments TLV320AC37CN, TLV320AC36IPTR, TLV320AC36IPT, TLV320AC36IDWR, TLV320AC36IDW Datasheet

TLV320AC36, TLV320AC37 3-V VOICE-BAND AUDIO PROCESSORS (VBAP )

SLWS006B ± NOVEMBER 1994 ± REVISED OCTOBER 1997

DSingle 3-V Operation

DLow Power Consumption:

±Operating Mode . . . 20 mW Typ

±Standby Mode . . . 5 mW Typ

±Power-Down Mode . . . 2 mW Typ

DCombined A/D, D/A, and Filters

DExtended Variable-Frequency Operation

±Sample Rates up to 16 kHz

±Pass-Band up to 7.2 kHz

DElectret Microphone Bias Reference Voltage Available

DDrive a Piezo Speaker Directly

DCompatible With All Digital Signal Processors (DSPs)

DSelectable Between 8-Bit Companded and 13-Bit (Dynamic Range) Linear Conversion:

±TLV320AC36 . . . -Law and Linear Modes

±TLV320AC37 . . . A-Law and Linear Modes

DProgrammable Volume Control in Linear Mode

D300 Hz ± 3.6 kHz Passband with Specified Master Clock

DDesigned for Standard 2.048-MHz Master Clock for U.S. Analog, U.S. Digital, CT2, DECT, GSM, and PCS Standards for Hand-Held Battery-Powered Telephones

DW OR N PACKAGE

(TOP VIEW)

	PDN					1	20			MICBIAS
	EARA					2	19			MICGS
	EARB					3	18			MICIN
	EARGS					4	17			VMID
		VCC				5	16			GND
	MICMUTE					6	15			LINSEL
	DCLKR
						7	14			TSX/DCLKX
		DIN				8	13			DOUT
		FSR				9	12			FSX
EARMUTE						10	11			CLK

													PT PACKAGE
														(TOP VIEW)
						NC		NC EARGS				EARB		EARA PDN MICBIAS MICGS								MICIN NC				NC		NC
NC				48 47 46								45 44 43 42 41 40 39 38 37																					VMID
				1																								36
NC				2																								35					NC
NC				3																								34					AGND
AVCC				4																								33					NC
																																	NC
NC				5																								32
NC				6																								31					NC
NC				7																								30					NC
NC				8																								29					NC
DVCC				9																								28					NC
																												27					DGND
NC				10
																												26
MICMUTE				11																													LINSEL
NC				12																								25					NC
					13			14 15 16 17 18 19 20 21 22 23 24
						NC		DCLKR DIN				FSR		EARMUTE NC CLK FSX								DOUT		TSX/DCLKX		NC		NC
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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

VBAP is a trademark of Texas Instruments Incorporated.

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 1997, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

1

TLV320AC36, TLV320AC37

3-V VOICE-BAND AUDIO PROCESSORS (VBAP )

SLWS006B ± NOVEMBER 1994 ± REVISED OCTOBER 1997

description

The TLV320AC36 and TLV320AC37 voice-band audio processor (VBAP) integrated circuits are designed to perform the transmit encoding (A/D conversion) and receive decoding (D/A conversion) together with transmit and receive filtering for voice-band communications systems. Cellular telephone systems are targeted in particular; however, these integrated circuits can function in other systems including digital audio, telecommunications, and data acquisition.

These devices are pin-selectable for either of two modes, companded and linear, providing data in two formats. In the companded mode, data is transmitted and received in 8-bit words. In the linear mode, 13 bits of data, and either three bits of gain-setting control data, or three zero bits of padding to create a16-bit word, are sent and received.

The transmit section is designed to interface directly with an electret microphone element. The microphone input signal (MICIN) is buffered and amplified with provision for setting the amplifier gain to accommodate a range of signal input levels. The amplified signal is passed through antialiasing and band-pass filters. The filtered signal is then applied to the input of a compressing analog-to-digital converter (COADC) when companded mode is selected. Otherwise, the analog-to-digital converter performs a linear conversion. The resulting data is then clocked out of DOUT as a serial data stream.

The receive section takes a frame of serial data on DIN and converts it to analog through an expanding digital-to-analog converter (EXDAC) when the companded mode is selected; otherwise, a linear conversion is performed. The analog signal then passes through switched capacitor filters, which provide out-of-band rejection, (sin x)/x correction functions, and smoothing. The filtered signal is sent to the earphone amplifier. The earphone amplifier has a differential output with adjustable gain and is designed to minimize static power dissipation.

A single on-chip high-precision band-gap circuit generates all voltage references, eliminating the need for external reference voltages. An internal reference voltage equal to VCC /2, VMID, is used to develop the midlevel virtual ground for all the amplifier circuits and the microphone bias circuit. Another reference voltage, MICBIAS, can supply bias current for the microphone.

The TLV320AC3xC devices are characterized for operation from 0°C to 70°C. The TLV320AC3xI devices are characterized for operation from ±40°C to 85°C.

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TLV320AC36, TLV320AC37 3-V VOICE-BAND AUDIO PROCESSORS (VBAP )

SLWS006B ± NOVEMBER 1994 ± REVISED OCTOBER 1997

functional block diagram

LINSEL 15

MICMUTE	6	Input		Transmit
				Third-Order
	18	Buffer
MICIN				Antialias
MICGS	19
				Band-Gap
				Voltage
			VMID	Reference
VMID	17		VMID
MICBIAS	20		Generator

Transmit

Transmit

Output

13

Sixth-Order

First-Order

ADC

DOUT

Logic

Low Pass

High Pass

12 FSX

256 kHz

8 kHz

A/D

Autozero

Converter

Voltage

Reference

14

TSX/DCLKX

256 kHz

Clock

Clock

11 CLK

Generator

Control

D/A

8 kHz

7

DCLKR

Converter

Voltage

Reference

256 kHz

9 FSR

EARA

2

3

Earphone

Receive

Receive

Input

8

EARB

DAC

DIN

EARGS

4

Amplifier

Buffer

Filter

Logic

10

EARMUTE

15

5

16

1

LINSEL

VCC

GND

PDN

NOTE A: Terminal numbers shown are for the DW and N packages.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

3

TLV320AC36, TLV320AC37

3-V VOICE-BAND AUDIO PROCESSORS (VBAP )

SLWS006B ± NOVEMBER 1994 ± REVISED OCTOBER 1997

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

DW, N

PT

AGND

Ð

34

Ground return for all internal analog circuits

AVCC

Ð

4

3-V supply voltage for all internal analog circuits

CLK

11

19

I

Clock input. In the fixed-data-rate mode, CLK is the master clock input as well as the transmit and

receive data clock input . In the variable-data-rate mode, CLK is the master clock input only (digital).

DCLKR

7

14

I

Selection of fixedor variable-data-rate operation. When DCLKR is connected to VCC, the device

operates in the fixed-data-rate mode. When DCLKR is not connected to VCC, the device operates in

the variable-data-rate mode and DCLKR becomes the receive data clock (digital).

DGND

Ð

27

Ground return for all internal digital circuits

DIN

8

15

I

Receive data input. Input data is clocked in on consecutive negative transitions of the receive data

clock, which is CLK for a fixed data rate and DCLKR for a variable data rate (digital).

DOUT

13

21

O

Transmit data output. Transmit data is clocked out on consecutive positive transitions of the transmit

data clock, which is CLK for a fixed data rate and DCLKX for a variable data rate (digital).

DVCC

Ð

9

3-V supply voltage for all internal digital circuits

EARA

2

44

O

Earphone output. EARA forms a differential drive when used with the EARB signal (analog).

EARB

3

45

O

Earphone output. EARB forms a differential drive when used with the EARA signal (analog).

EARGS

4

46

I

Earphone gain set input of feedback signal for the earphone output. The ratio of an external potential

divider network connected across EARA and EARB adjusts the power amplifier gain. Maximum gain

occurs when EARGS is connected to EARB. Minimum gain occurs when EARGS is connected to

EARA. Earphone frequency response correction is performed using an RC approach (analog).

10

17

I

Earphone output mute control signal. When

is low, the output amplifier is disabled and no

EARMUTE

EARMUTE

audio is sent to the earphone (digital).

FSR

9

16

I

Frame-synchronization clock input for the receive channel. In the variable-data-rate mode, this signal

must remain high for the duration of the time slot. The receive channel enters the standby condition

when FSR is TTL-low for five frames or longer. The device enters a production test-mode condition

when either FSR or FSX is held high for five frames or longer (digital).

FSX

12

20

I

Frame synchronization clock input for the transmit channel. FSX operates independently of FSR, but

also in an analogous manner to FSR. The transmit channel enters the standby condition when FSX

is low for five frames or longer. The device enters a production test-mode condition when either FSX

or FSR is held high for five frames or longer (digital).

GND

16

Ð

Ground return for all internal circuits

15

26

I

Linear selection input. When low,

selects linear coding/decoding. When high,

selects

LINSEL

LINSEL

LINSEL

companded coding/decoding. Companding code on the 'AC36 is -law, and companding code on the

'AC37 is A-law (digital).

MICBIAS

20

42

O

Microphone bias. MICBIAS voltage for the electret microphone is equal to VMID.

MICGS

19

41

O

Output of the internal microphone amplifier. MICGS is used as the feedback to set the microphone

amplifier gain. If sidetone is required, it is accomplished by connecting a series network between

MICGS and EARGS (analog).

MICIN

18

40

I

Microphone input. Electret microphone input to the internal microphone amplifier (analog)

6

11

I

Microphone input mute control signal. When

is active (low), zero code is transmitted (dig.).

MICMUTE

MICMUTE

1

43

I

Power-down input. When

is low, the device powers down to reduce power consumption (digital).

PDN

PDN

14

22

I/O

Transmit time slot strobe (active-low output) or data clock (input) for the transmit channel. In the

TSX/DCLKX

fixed-data-rate mode, TSX/DCLKX is an open-drain output that pulls to ground and is used as an

enable signal for a 3-state buffer. In the variable-data-rate mode, DCLKX becomes the transmit data

clock input (digital).

VCC

5

Ð

3-V supply voltage for all internal circuits

VMID

17

36

O

VCC /2 bias voltage reference. A pair of external, low-leakage, high-frequency capacitors

(1 F and 470 pF) should be connected between VMID and ground for filtering.

4	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TLV320AC36, TLV320AC37 3-V VOICE-BAND AUDIO PROCESSORS (VBAP )

SLWS006B ± NOVEMBER 1994 ± REVISED OCTOBER 1997

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

Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . ±0.3 V to 5.5 V
Output voltage range at DOUT, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . ±0.3 V to 5.5 V
Input voltage range at DIN, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . ±0.3 V to 5.5 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	See Dissipation Rating Table
Operating free-air temperature range: C suffix . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . 0°C to 70°C
I suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . ±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 . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . . . 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 value is with respect to GND.

		DISSIPATION RATING TABLE
	PACKAGE	TA ≤ 25°C	DERATING FACTOR	TA = 70°C	TA = 85°C
		POWER RATING	ABOVE TA = 25°C	POWER RATING	POWER RATING
	DW	1025 mW	8.2 mW/°C	656 mW	533 mW
	N	1150 mW	9.2 mW/°C	736 mW	598 mW
	PT	1075 mW	7.1 mW/°C	756 mW	649 mW

recommended operating conditions (see Note 2)

			MIN	MAX	UNIT
	Supply voltage, VCC (see Note 3)		2.7	3.3	V
	High-level input voltage, VIH		2.2		V
	Low-level input voltage, VIL			0.8	V
	Load resistance between EARA and EARB, RL (see Note 4)		600		Ω
	Load capacitance between EARA and EARB, CL (see Note 4)			50	nF
	Operating free-air temperature, TA	TLV320AC36C, TLV320AC37C	0	70	°C
		TLV320AC36I, TLV320AC37I	± 40	85

NOTES: 2. To avoid possible damage to these CMOS devices and resulting reliability problems, the power-up sequence detailed in the system reliability features paragraph should be followed.

3.Voltages at analog inputs, outputs, and VCC are with respect to GND.

4.RL and CL should not be applied simultaneously.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

5

TLV320AC36, TLV320AC37

3-V VOICE-BAND AUDIO PROCESSORS (VBAP )

SLWS006B ± NOVEMBER 1994 ± REVISED OCTOBER 1997

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

supply current, fDCLKR or fDCLKX = 2.048 MHz, outputs not loaded, VCC = 3 V, TA = 25°C

PARAMETER				TEST CONDITIONS	MIN MAX	UNIT
	Operating		PDN	is high with CLK signal present	7.5
	Power down			is low for 500 µs	0.75
			PDN
ICC Supply current from VCC						mA
	Standby ± both			is high with FSX and FSR held low	2
			PDN
				is high with either FSX or FSR pulsing with the
	Standby ± one		PDN		4.5
			other held low

digital interface

	PARAMETER		TEST CONDITIONS		MIN	TYP²	MAX	UNIT
VOH	High-level output voltage	DOUT	IOH = ± 3.2 mA,	VCC = 3 V	2.4	2.8		V
VOL	Low-level output voltage		IOL = 3.2 mA,	VCC = 3 V		0.2	0.4	V
IIH	High-level input current, any digital input		VI = 2.2 V to VCC				10	µA
IIL	Low-level input current, any digital input		VI = 0 to 0.8 V				10	µA
Ci	Input capacitance					5		pF
Co	Output capacitance					5		pF

² All typical values are at VCC = 3 V, TA = 25°C.

microphone interface

	PARAMETER					TEST CONDITIONS	MIN	TYP² MAX	UNIT
VIO	Input offset voltage at MICIN					VI = 0 to 3 V		± 5	mV
IIB	Input bias current at MICIN							± 200	nA
B	Unity-gain bandwidth, open loop at MICIN³							1.5	MHz
1
Ci	Input capacitance at MICIN							5	pF
AV	Large-signal voltage amplification at MICGS							10000	V/ V
					VMID		3		µA
IOmax	Maximum output current
					MICBIAS		1		mA
					(source only)
² All typical values are at V		CC	= 3 V, T	= 25°C.
			A

³ The frequency of the first pole is 100 Hz.

speaker interface

	PARAMETER		TEST CONDITIONS		MIN	TYP² MAX	UNIT
VO(PP)	AC output voltage					3§	Vpp
VOO	Output offset voltage at EARA, EARB (single-ended)	Relative to GND				80	mVpk
II(lkg)	Input leakage current at EARGS	VI = 0.5 V to (VCC ± 0.5) V				± 200	nA
IOmax	Maximum output current	RL = 600 Ω				± 2.5	mA
ro	Output resistance at EARA, EARB					1	Ω
	Gain change			low, max level when muted	± 60		dB
			EARMUTE

² All typical values are at VCC = 3 V, TA = 25°C. § 2.5 Vpp when VCC is 2.7 V.

6	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TLV320AC36, TLV320AC37 3-V VOICE-BAND AUDIO PROCESSORS (VBAP )

SLWS006B ± NOVEMBER 1994 ± REVISED OCTOBER 1997

transmit gain and dynamic range, companded mode ( -law or A-law) or linear mode selected, VCC = 3 V, TA = 25°C (unless otherwise noted) (see Notes 5 and 6)

PARAMETER	TEST CONDITIONS		MIN MAX	UNIT
	Companded mode selected, µ-law ('AC36)		0.614
Transmit reference-signal level (0 dB) (see Note 7)	Companded mode selected, A-law ('AC37)		0.616	Vrms
	Linear mode selected ('AC36 and 'AC37)		0.626
	Companded mode selected, µ-law ('AC36)		2.5
Overload-signal level (MICIN at unity gain)				Vpp
	Companded mode selected, A-law ('AC37)		2.5
	Linear mode selected ('AC36 and 'AC37)		2.5
Absolute gain error	0-dB input signal		± 1	dB
	MICIN to DOUT at 0 dBm0 to ± 40 dBm0		± 0.5	dB
Gain error with input level relative to gain at ±10 dBm0	MICIN to DOUT at ± 41 dBm0 to ± 50 dBm0		± 1.5	dB
	MICIN to DOUT at ± 51 dBm0 to ± 55 dBm0		± 2	dB
Gain variation	VCC ± 10%,	TA = 0°C to 70°C	± 0.5	dB

NOTES: 5. Unless otherwise noted, the analog input is 0 dB, 1020-Hz sine wave, where 0 dB is defined as the zero-reference point of the channel under test.

6.The input amplifier is set for inverting unity gain.

7.The reference-signal level, which is input to the transmit channel, is defined as a value 3 dB below the full-scale value of 2 V.

transmit filter transfer, companded mode ( -law or A-law) or linear mode selected, over recommended ranges of supply voltage and free-air temperature, CLK = 2.048 MHz, FSX = 8 kHz (see Note 6)

	PARAMETER	TEST CONDITIONS		MIN	MAX	UNIT
			fMICIN = 50 Hz	±10	0
			fMICIN = 200 Hz	±2.8	0
	Gain relative to input signal gain at	Input amplifier set for unity gain,	fMICIN = 300 Hz to 3 kHz		±0.25
		noninverting maximum gain output signal	fMICIN = 3.3 kHz	± 0.55	0.2	dB
	1.02 kHz
		at MICIN is 0 dB	fMICIN = 3.4 kHz	± 1	± 0.1
			fMICIN = 4 kHz		±14
			fMICIN ≥ 4.6 kHz		± 32
	NOTE 6. The input amplifier is set for inverting unity gain.

transmit idle channel noise and distortion, companded mode with -law or A-law selected, over recommended ranges of supply voltage and operating free-air temperature (see Note 8)

	PARAMETER	TEST CONDITIONS	MIN MAX	UNIT
	Transmit noise, psophometrically weighted	MICIN connected to MICGS through a 10-kΩ resistor	± 72	dB0p
	Transmit noise, C-message weighted	MICIN connected to MICGS through a 10-kΩ resistor	10	dBrnC0
		MICIN to DOUT at 0 dBm0 to ± 24 dBm0	36
		MICIN to DOUT at ±25 dBm0 to ± 30 dBm0	34
	Transmit signal-to-distortion ratio with sine-wave input			dB
		MICIN to DOUT at ± 31 dBm0 to ± 38 dBm0	30
		MICIN to DOUT at ± 39 dBm0 to ± 40 dBm0	24
		MICIN to DOUT at ± 41 dBm0 to ± 45 dBm0	20
	Intermodulation distortion, 2-tone CCITT method,	CCITT G.712 (7.1), R2	49	dB
	composite power level ±13 dBm0	CCITT G.712 (7.2), R3	51

NOTE 8: Transmit noise, linear mode: 200 µVrms is equivalent to ±74 dB (referenced to device 0-dB level).

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