TCM320AC36, TCM320AC37 VOICE-BAND AUDIO PROCESSORS (VBAP )
SLWS003C ± MAY 1992 ± REVISED APRIL ± 1998
DSingle 5-V Operation
DLow Power Consumption:
±Operating Mode . . . 40 mW Typ
±Standby Mode . . . 5 mW Typ
±Power-Down Mode . . . 3 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:
±TCM320AC36 . . . μ-Law and Linear
Modes
±TCM320AC37 . . . 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)
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PDN |
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MICBIAS |
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EARGS |
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VMID |
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VCC |
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GND |
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MICMUTE |
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LINSEL |
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DCLKR |
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TSX/DCLKX |
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DIN |
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FSR |
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FSX |
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EARMUTE |
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CLK |
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PT PACKAGE |
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NC |
NC EARGS |
EARB |
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EARA PDN MICBIAS MICGS |
MICIN NC |
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NC |
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48 47 46 |
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VMID |
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NC |
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NC |
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AGND |
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AVCC |
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DVCC |
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DGND |
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MICMUTE |
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LINSEL |
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13 |
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14 15 16 17 18 19 20 21 22 23 24 |
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NC |
DCLKR DIN |
FSR |
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EARMUTE NC CLK FSX |
DOUT |
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TSX/DCLKX |
NC |
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NC ± No internal connection |
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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 1998, Texas Instruments Incorporated
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
1 |
TCM320AC36, TCM320AC37
VOICE-BAND AUDIO PROCESSORS (VBAP )
SLWS003C ± MAY 1992 ± REVISED APRIL ± 1998
description
The TCM320AC36 and TCM320AC37 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 a 16-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 TCM320AC3xC devices are characterized for operation from 0°C to 70°C. The TCM320AC3xI devices are characterized for operation from ±40°C to 85°C.
2 |
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
TCM320AC36, TCM320AC37
VOICE-BAND AUDIO PROCESSORS (VBAP )
SLWS003C ± MAY 1992 ± REVISED APRIL ± 1998
functional block diagram
LINSEL 15
MICMUTE |
6 |
Input |
Transmit |
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Third-Order |
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18 |
Buffer |
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MICIN |
Antialias |
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MICGS |
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Transmit |
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Transmit |
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Output |
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Sixth-Order |
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First-Order |
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ADC |
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DOUT |
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Low Pass |
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High Pass |
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Logic |
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12 |
FSX |
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256 kHz |
8 kHz |
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Band-Gap |
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Voltage |
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VMID |
Reference |
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A/D |
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VMID |
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VMID |
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Converter |
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MICBIAS |
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Generator |
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Reference |
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256 kHz |
Clock |
Clock |
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Generator |
Control |
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D/A |
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DCLKR |
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Converter |
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Voltage |
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EARA |
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Receive |
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Input |
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EARB |
Earphone |
DAC |
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DIN |
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EARGS |
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Amplifier |
Buffer |
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Filter |
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EARMUTE |
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LINSEL |
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VCC |
GND PDN |
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Terminal numbers shown are for the DW and N packages.
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
3 |
TCM320AC36, TCM320AC37
VOICE-BAND AUDIO PROCESSORS (VBAP )
SLWS003C ± MAY 1992 ± REVISED APRIL ± 1998
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Terminal Functions |
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TERMINAL |
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I/O |
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DESCRIPTION |
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DW, N |
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AGND |
Ð |
34 |
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Ground return for all internal analog circuits |
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AVCC |
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5-V supply voltage for all internal analog circuits |
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CLK |
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Clock input. In the fixed-data-rate mode, CLK is the master clock input as well as the transmit and |
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receive data clock input . In the variable-data-rate mode, CLK is the master clock input only (digital). |
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DCLKR |
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14 |
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Selection of fixedor variable-data-rate operation. When DCLKR is connected to VCC, the device |
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operates in the fixed-data-rate mode. When DCLKR is not connected to VCC, the device operates in |
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the variable-data-rate mode, and DCLKR becomes the receive data clock (digital). |
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DGND |
Ð |
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Ground return for all internal digital circuits |
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DIN |
8 |
15 |
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Receive data input. Input data is clocked in on consecutive negative transitions of the receive data |
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clock, which is CLK for a fixed data rate and DCLKR for a variable data rate (digital). |
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DOUT |
13 |
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Transmit data output. Transmit data is clocked out on consecutive positive transitions of the transmit |
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data clock, which is CLK for a fixed data rate and DCLKX for a variable data rate (digital). |
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DVCC |
Ð |
9 |
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5-V supply voltage for all internal digital circuits |
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EARA |
2 |
44 |
O |
Earphone output. EARA forms a differential drive when used with the EARB signal (analog). |
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EARB |
3 |
45 |
O |
Earphone output. EARB forms a differential drive when used with the EARA signal (analog). |
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EARGS |
4 |
46 |
I |
Earphone gain set input of feedback signal for the earphone output. The ratio of an external potential |
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divider network connected across EARA and EARB adjusts the power amplifier gain. Maximum gain |
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occurs when EARGS is connected to EARB. Minimum gain occurs when EARGS is connected to |
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EARA. Earphone frequency response correction is performed using an RC approach (analog). |
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10 |
17 |
I |
Earphone output mute control signal. When |
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is low, the output amplifier is disabled and no |
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EARMUTE |
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EARMUTE |
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audio is sent to the earphone (digital). |
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FSR |
9 |
16 |
I |
Frame-synchronization clock input for the receive channel. In the variable-data-rate mode, this signal |
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must remain high for the duration of the time slot. The receive channel enters the standby condition |
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when FSR is TTL-low for five frames or longer. The device enters a production test-mode condition |
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when either FSR or FSX is held high for five frames or longer (digital). |
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FSX |
12 |
20 |
I |
Frame synchronization clock input for the transmit channel. FSX operates independently of FSR, but |
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also in an analogous manner to FSR. The transmit channel enters the standby condition when FSX |
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is low for five frames or longer. The device enters a production test-mode condition when either FSX |
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or FSR is held high for five frames or longer (digital). |
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GND |
16 |
Ð |
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Ground return for all internal circuits |
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15 |
26 |
I |
Linear selection input. When low, |
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selects linear coding/decoding. When high, |
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selects |
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LINSEL |
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LINSEL |
LINSEL |
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companded coding/decoding. Companding code on the 'AC36 is μ-law, and companding code on the |
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'AC37 is A-law (digital). |
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MICBIAS |
20 |
42 |
O |
Microphone bias. MICBIAS voltage for the electret microphone is equal to VMID. |
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MICGS |
19 |
41 |
O |
Output of the internal microphone amplifier. MICGS is used as the feedback to set the microphone |
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amplifier gain. If sidetone is required, it is accomplished by connecting a series network between |
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MICGS and EARGS (analog). |
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MICIN |
18 |
40 |
I |
Microphone input. Electret microphone input to the internal microphone amplifier (analog) |
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6 |
11 |
I |
Microphone input mute control signal. When |
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is active (low), zero code is transmitted (dig.). |
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MICMUTE |
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MICMUTE |
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1 |
43 |
I |
Power-down input. When |
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is low, the device powers down to reduce power consumption (digital). |
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PDN |
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PDN |
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14 |
22 |
I/O |
Transmit time slot strobe (active-low output) or data clock (input) for the transmit channel. In the |
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TSX/DCLKX |
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fixed-data-rate mode, TSX/DCLKX is an open-drain output that pulls to ground and is used as an |
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enable signal for a 3-state buffer. In the variable-data-rate mode, DCLKX becomes the transmit data |
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clock input (digital). |
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VCC |
5 |
Ð |
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5-V supply voltage for all internal circuits |
|
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VMID |
17 |
36 |
O |
VCC /2 bias voltage reference. A pair of external, low-leakage, high-frequency capacitors (1 μF and |
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470 pF) should be connected between VMID and ground for filtering. |
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4 |
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
TCM320AC36, TCM320AC37
VOICE-BAND AUDIO PROCESSORS (VBAP )
SLWS003C ± MAY 1992 ± REVISED APRIL ± 1998
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)²
Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . ±0.3 V to 7 V |
Output voltage range at DOUT, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . ±0.3 V to 7 V |
Input voltage range at DIN, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . ±0.3 V to 7 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 |
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|
|
Supply voltage, VCC (see Note 3) |
|
4.5 |
5.5 |
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) |
|
|
113 |
nF |
|
Operating free-air temperature, TA |
TCM320AC36C, TCM320AC37C |
0 |
70 |
°C |
|
|
|
|
|||
TCM320AC36I, TCM320AC37I |
± 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 |
TCM320AC36, TCM320AC37
VOICE-BAND AUDIO PROCESSORS (VBAP )
SLWS003C ± MAY 1992 ± REVISED APRIL ± 1998
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 = 5 V, TA = 25°C
PARAMETER |
|
|
|
|
TEST CONDITIONS |
MIN MAX |
UNIT |
|
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|
Operating |
|
|
PDN |
is high with CLK signal present |
9.9 |
|
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|
||
|
Power down |
|
|
0.85 |
|
||
|
|
|
PDN |
is low for 500 μs |
|
||
ICC Supply current from VCC |
|
|
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|
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 |
6 |
|
||
|
|
other held low |
|
||||
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digital interface
|
PARAMETER |
|
|
|
TEST CONDITIONS |
MIN |
TYP² |
MAX |
UNIT |
||||
VOH |
High-level output voltage |
|
|
DOUT |
IOH = ± 3.2 mA, |
VCC = 5 V |
2.4 |
4.6 |
|
V |
|||
VOL |
Low-level output voltage |
|
|
IOL = 3.2 mA, |
VCC = 5 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 |
|
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|
5 |
|
pF |
|
Co |
Output capacitance |
|
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|
5 |
|
pF |
|
² All typical values are at V |
CC |
= 5 V, T |
= 25°C. |
|
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|||
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A |
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microphone interface |
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||
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|||
|
PARAMETER |
|
|
|
TEST CONDITIONS |
|
MIN |
TYP² |
MAX |
UNIT |
|||
VIO |
Input offset voltage at MICIN |
|
|
|
VI = 0 to 5 V |
|
|
|
± 5 |
mV |
|||
IIB |
Input bias current at MICIN |
|
|
|
|
|
|
|
|
± 200 |
nA |
||
B1 |
Unity-gain bandwidth, open loop at MICIN |
|
|
|
|
1 |
|
MHz |
|||||
Ci |
Input capacitance at MICIN |
|
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|
|
|
|
5 |
|
pF |
||
AV |
Large-signal voltage amplification at MICGS |
|
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|
10000 |
|
V/ V |
|||||
|
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|
VMID |
|
|
|
1 |
|
|
μA |
IOmax |
Maximum output current |
|
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||
|
|
MICBIAS |
|
|
|
1 |
|
|
mA |
||||
|
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|
(source only) |
|
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||
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|
² All typical values are at VCC = 5 V, TA = 25°C.
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 |
|
± 5 |
mA |
||
ro |
Output resistance at EARA, EARB |
|
|
|
|
1 |
Ω |
|
Gain change |
|
|
low, max level when muted |
± 80 |
|
dB |
|
|
EARMUTE |
|
||||
|
|
|
|
|
|
|
|
² All typical values are at VCC = 5 V, TA = 25°C.
6 |
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
TCM320AC36, TCM320AC37
VOICE-BAND AUDIO PROCESSORS (VBAP )
SLWS003C ± MAY 1992 ± REVISED APRIL ± 1998
transmit gain and dynamic range, companded mode (μ-law or A-law) or linear mode selected, VCC = 5 V, TA = 25°C (unless otherwise noted) (see Notes 5 and 6)
PARAMETER |
TEST CONDITIONS |
MIN MAX |
UNIT |
||
|
|
|
|
||
|
Companded mode selected, μ-law ('AC36) |
0.982 |
|
||
Transmit reference-signal level (0 dB) (see Note 7) |
|
|
Vrms |
||
Companded mode selected, A-law ('AC37) |
0.985 |
||||
|
|
|
|
||
|
Linear mode selected ('AC36 and 'AC37) |
1.001 |
|
||
|
|
|
|
||
|
Companded mode selected, μ-law ('AC36) |
4 |
|
||
Overload-signal level (MICIN at unity gain) |
|
|
Vpp |
||
Companded mode selected, A-law ('AC37) |
4 |
||||
|
|
|
|
||
|
Linear mode selected ('AC36 and 'AC37) |
4 |
|
||
|
|
|
|
|
|
Absolute gain error |
0-dB input signal |
|
± 1 |
dB |
|
|
|
|
|
||
|
MICIN to DOUT at 3 dBm0 to ± 36 dBm0 |
± 0.5 |
dB |
||
|
|
|
|
||
Gain error with input level relative to gain at ±10 dBm0 |
MICIN to DOUT at ± 37 dBm0 to ± 40 dBm0 |
± 1 |
|||
|
|||||
|
|
|
|
||
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 (μ-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 |
±1.8 |
0 |
|
|
Gain relative to input signal gain at |
Input amplifier set for unity gain, |
fMICIN = 300 Hz to 3 kHz |
|
±0.15 |
|
|
noninverting maximum gain output signal |
fMICIN = 3.3 kHz |
± 0.35 |
0.04 |
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 μ-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 |
± 71 |
dB0p |
|
|
|
|
|
|
Transmit noise, C-message weighted |
MICIN connected to MICGS through a 10-kΩ resistor |
10 |
dBrnC0 |
|
|
|
|
|
|
|
MICIN to DOUT at 0 dBm0 to ± 17 dBm0 |
36 |
|
|
|
|
|
|
|
|
MICIN to DOUT at ±18 dBm0 to ± 23 dBm0 |
34 |
|
|
Transmit signal-to-distortion ratio with sine-wave input |
|
|
dB |
|
MICIN to DOUT at ± 24 dBm0 to ± 29 dBm0 |
30 |
|||
|
|
|
|
|
|
MICIN to DOUT at ± 30 dBm0 to ± 35 dBm0 |
24 |
|
|
|
|
|
|
|
|
MICIN to DOUT at ± 36 dBm0 to ± 45 dBm0 |
16 |
|
|
|
|
|
|
|
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).
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
7 |