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TL852CNE4

更新时间： 2024-11-23 12:02:19
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德州仪器 - TI 接收机
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12页 586K
描述
SONAR RANGING RECEIVER

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TL852CNE4 数据手册

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SLSS003 − SEPTEMBER 1983 − REVISED MARCH 1988  
N PACKAGE  
(TOP VIEW)  
D
D
D
Designed for Use With the TL851 in Sonar  
Ranging Modules Like the SN28827  
Digitally Controlled Variable-Gain  
Variable-Bandwidth Amplifier  
GND  
GCD  
GCA  
GCB  
GCC  
NC  
G1IN  
XIN  
GADJ  
LC  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
Operational Frequency Range of 20 kHz  
to 90 kHz  
D
TTL-Compatible  
V
CC  
G1OUT  
D
Operates From Power Sources of 4.5 V  
to 6.8 V  
NC  
REC  
G2IN  
BIAS  
D
D
Interfaces to Electrostatic or Piezoelectric  
Transducers  
NC − No internal connection  
Overall Gain Adjustable With One External  
Resistor  
description  
The TL852 is an economical sonar ranging receiver integrated circuit for use with the TL851 control integrated  
circuit. A minimum of external components is required for operation, and this amplifier easily interfaces to  
Polaroid’s 50-kHz electrostatic transducer. An external 68-kΩ 5% resistor from BIAS to GND provides the  
internal biasing reference. Amplifier gain can be set with a resistor from G1IN to GADJ. Required amplifier gain  
will vary for different applications. Using the detect-level measurement circuit of Figure 1, a nominal  
peak-to-peak value of 230 mV input during gain step 2 is recommended for most applications. For reliable  
operation, a level no lower than 50 mV should be used. The recommended detect level of 230 mV can be  
obtained for most amplifiers with an R1 value between 5 kΩ and 20 kΩ  
Digital control of amplifier gain is provided with gain control inputs GCA, GCB, GCC, and GCD. These inputs  
must be driven synchronously (all inputs stable within 0.1 µs) to avoid false receive output signals due to invalid  
logic counts. This can be done easily with the TL851 control integrated circuit. A plot showing relative gain for  
the various gain steps versus time can be seen in Figure 2. To dampen ringing of the 50-kHz electrostatic  
transducer, a 5-kΩ resistor from G1IN to XIN is recommended.  
An external parallel combination of inductance and capacitance between LC and V  
provides an amplifier with  
CC  
an externally controlled gain and Q. This not only allows control of gain to compensate for attenuation of signal  
with distance, but also maximizes noise and sidelobe rejection. Care must be taken to accurately tune the L-C  
combination at operating frequency or gain and Q will be greatly reduced at higher gain steps.  
AC coupling between stages of the amplifier is accomplished with a 0.01-mF capacitor for proper biasing.  
The receive output is normally held at a low level by an internal 1-µA current source. When an input of sufficient  
amplitude is received, the output is driven alternately by the 1-µA discharge current and a 50-µA charging  
current. A 1000-pF capacitor is required from REC to GND to integrate the received signal so that one or two  
noise pulses will not be recognized.  
XIN provides clamping for the transformer secondary when used for transducer transmit drive as shown in  
Figure 4 of the SN28827 data sheet.  
The TL852 is characterized for operation from 0°C to 40°C.  
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Copyright 1988, Texas Instruments Incorporated  
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ꢙ ꢝ ꢚ ꢙꢒ ꢓꢧ ꢕꢔ ꢘ ꢠꢠ ꢞꢘ ꢖ ꢘ ꢗ ꢝ ꢙ ꢝ ꢖ ꢚ ꢢ  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443  
1234567...12

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TL852CNE4 替代型号

型号 品牌 替代类型 描述 数据表
TL852CN TI

完全替代

 SONAR RANGING RECEIVER

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