參數(shù)資料
型號： TLC32044M
廠商： Texas Instruments, Inc.
英文描述： VOICE-BAND ANALOG INTERFACE CIRCUITS
中文描述： 語音頻帶模擬接口電路
文件頁數(shù)： 16/39頁
文件大?。?/td> 535K
代理商： TLC32044M
TLC32044C, TLC32044E, TLC32044I, TLC32044M TLC32045C, TLC32045I
VOICE-BAND ANALOG INTERFACE CIRCUITS
SLAS017F – MARCH 1988 – REVISED MAY 1995
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
test modes
The TLC32044 or TLC32045 can be operated in special test modes. These test modes are used by Texas
Instruments to facilitate testing of the device during manufacturing. They are not intended to be used in real
applications; however, they allow the filters in the A/D and D/A paths to be used without using the A/D and D/A
converters.
In normal operation, the nonusable (NU) terminals are left unconnected. These NU terminals are used by the
factory to speed up testing of the TLC32044 or TLC32045 analog interface circuits (AIC). When the device is
used in normal (non-test mode) operation, the NU terminal (terminal 1) has an internal pulldown to –5 V.
Externally connecting 0 V or 5 V to terminal 1 puts the device in test-mode operation. Selecting one of the
possible test modes is accomplished by placing a particular voltage on certain terminals. A description of these
modes is provided in Table 2 and Figures 5 and 6.
Table 2. List of Test Modes
TEST
D/A PATH TEST (TERMINAL 1 to 5 V)
TEST FUNCTION
The low-pass switched-capacitor filter clock is brought out to
DR. This clock signal is normally internal.
A/D PATH TEST (TERMINAL 1 to 0)
TEST FUNCTION
The bandpass switched-capacitor filter clock is brought out to
DR. This clock signal is normally internal.
TERMINALS
5
11
No change from normal operation. The EODX signal is
brought out to EODX.
The pulse that initiates the A/D conversion is brought out here.
This signal is normally internal.
3
The pulse that initiates the D/A conversion is brought out here.
No change from normal operation. The EODR signal is
brought out.
27 and 28
There are no test output signals provided on these terminals.
The outputs of the A/D path low-pass or bandpass filter
(depending upon control bit d2 – see AIC DX data word format
section) are brought out to these terminals. If the high-pass
section is inserted, the output will have a (sin x)/x droop. The
slope of the droop is determined by the ADC sampling
frequency, which is the high-pass section clock frequency
(see diagram of bandpass or low-pass filter test for receive
section). These outputs drive small (30-pF) loads.
15 and 16
D/A PATH LOW-PASS FILTER TEST: (WORD/BYTE) to –5 V
TEST FUNCTION
The inputs of the D/A path low-pass filter are brought out to terminals 15 and 16. The D/A input to this filter is removed. If (sin x)/x
correction filter is inserted, the OUT+ and OUT– signals have a flat response (see Figure 2). The common-mode range of these
inputs must not exceed
±
0.5 V.
In the test mode, the AIC responds to the setting of WORD/BYTE to –5 V, as if WORD/BYTE were set to 0 V. Thus, the byte mode is selected
for communicating between DSP and AIC. Either of the path tests (D/A or A/D) can be performed simultaneously with the D/A low-pass filter test.
In this situation, WORD/BYTE must be connected to –5 V, which initiates byte-mode communications.
相關(guān)PDF資料
PDF描述
TLC32044MFK VOICE-BAND ANALOG INTERFACE CIRCUITS
TLC32045C VOICE-BAND ANALOG INTERFACE CIRCUITS
TLC32045I VOICE-BAND ANALOG INTERFACE CIRCUITS
TLC32046C Wide-Band Analog Interface Circuit
TLC32046I Wide-Band Analog Interface Circuit
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC32044MFK 制造商:TI 制造商全稱:Texas Instruments 功能描述:VOICE-BAND ANALOG INTERFACE CIRCUITS
TLC32044MFK/B 制造商:Rochester Electronics LLC 功能描述:
TLC32044MFKB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Linear CODEC
TLC32044MJ 制造商:TI 制造商全稱:Texas Instruments 功能描述:VOICE-BAND ANALOG INTERFACE CIRCUITS
TLC32044MJB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Linear CODEC
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