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TL851CDR, TL851CDRG4, TL852

Table of contents:
Info of TL851CDR
Info of TL851CDRG4
Info of TL852

TL851CDR, TL851CDRG4, TL852 Selling Leads, Datasheet

MFG:Texas Instruments Category:RF and RFID Package Cooled:16-SOIC D/C:08+/09+

TL851CDR, TL851CDRG4, TL852 Datasheet download

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Part Number: TL851CDR

Category: RF and RFID

MFG: Texas Instruments

Package Cooled: 16-SOIC

D/C: 08+/09+

Description: IC SONAR RANGING CONTROL 16-SOIC

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TL851CDR Parameters

Technical/Catalog Information	TL851CDR
Vendor	Texas Instruments (VA)
Category	RF and RFID
Function	Sonar Ranging Receiver
Secondary Attributes	TTL-Compatible
Frequency	20kHz ~ 90kHz
RF Type	Sonar Control
Package / Case	16-SOIC (3.9mm Width)
Packaging	Digi-Reel?
Drawing Number	296; 4040047-4; D; 16
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	TL851CDR TL851CDR 296 18895 6 ND 296188956ND 296-18895-6

TL851CDRG4 Parameters

Technical/Catalog Information	TL851CDRG4
Vendor	Texas Instruments
Category	RF and RFID
Function	Sonar Ranging Control
Secondary Attributes	Synchronous 4-Bit Gain Control
Frequency	20kHz ~ 90kHz
RF Type	Sonar Control
Package / Case	16-SOIC (3.9mm Width)
Packaging	Tape & Reel (TR)
Drawing Number	296; 4040047-4; D; 16
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	TL851CDRG4 TL851CDRG4

TL852 General 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_CC provides an amplifier with 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.

TL852 Maximum Ratings

Voltage at any pin with respect to GND  . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 0.5 V to 7 V
Voltage at any pin with respect to VCC  . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . .. . . . 7 V to 0.5 V
XIN input current (50% duty cycle) . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . .. . . ±60 mA
Continuous power dissipation at (or below) 25°C free-air temperature (see Note 1) . . 1150 mW
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 40°C to 85°C
Storage temperature range   . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . 260°C
† Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the recommended operating conditions section of this specification is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: For operation above 25°C, derate linearly at the rate of 9.2 mW/°C.

TL852 Connection Diagram

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