TL852 SONAR RANGING RECEIVER SLSS003 – SEPTEMBER 1983 – REVISED MARCH 1988 D D D D D D D N PACKAGE (TOP VIEW) Designed for Use With the TL851 in Sonar Ranging Modules Like the SN28827 Digitally Controlled Variable-Gain Variable-Bandwidth Amplifier Operational Frequency Range of 20 kHz to 90 kHz TTL-Compatible Operates From Power Sources of 4.5 V to 6.8 V Interfaces to Electrostatic or Piezoelectric Transducers Overall Gain Adjustable With One External Resistor G1IN XIN GADJ LC VCC G1OUT G2IN BIAS 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 GND GCD GCA GCB GCC NC NC REC NC – No internal connection 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 VCC 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. Copyright 1988, 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. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 1 TL852 SONAR RANGING RECEIVER SLSS003 – SEPTEMBER 1983 – REVISED MARCH 1988 functional block diagram VCC 5 50 µA VCC – 2.1 V G2IN GCA GCB GCC GCD 0.3 V 7 9 14 13 12 Gain Control REC 1 µA 15 Reg Ref 8 BIAS 0.7 V G1IN GADJ LC XIN GND 6 1 3 4 2 16 schematic of gain control inputs GCA, GCB, GCC, AND GCD VCC INPUT GND 2 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • G1OUT TL852 SONAR RANGING RECEIVER SLSS003 – SEPTEMBER 1983 – REVISED MARCH 1988 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† 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. recommended operating conditions MIN MAX Supply voltage, VCC 4.5 6.8 High-level input voltage, VIH 2.1 GCA GCB, GCA, GCB GCC GCC, GCD Low-level input voltage, VIL 0.6 Bias resistor between BIAS and GND Operating free-air temperature, TA UNIT V V 64 72 kΩ 0 40 °C electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP‡ II = 40 mA II = – 40 mA Input clamp voltage at XIN Open-circuit input voltage at GCA, GCB, GCC, GCD High-level input current, IIH, into GCA, GCB, GCC, GCD Low-level input current, IIL, into GCA, GCB, GCC, GCD Raceive output current MAX 2.5 – 1.5 VCC = 5 V, VCC = 5 V, II = 0 VIH = 2 V VCC = 5 V, IG2IN = – 100 µA, VIL = 0 VO = 0.3 V 1 IG2IN = 100 µA, VO = 0.1 V – 50 Supply current, ICC ‡ Typical values are at VCC = 5 V and TA = 25°C. 2.5 • • V V – 0.5 mA –3 mA µA 45 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 UNIT mA 3 TL852 SONAR RANGING RECEIVER SLSS003 – SEPTEMBER 1983 – REVISED MARCH 1988 APPLICATION INFORMATION detect level versus gain step Detect level is measured by applying a 15-cycle burst of 49.4 kHz square wave just after the beginning of the gain step to be tested. The least burst amplitude that makes REC reach the trip level is defined to be the detect level. System gain is then inversely proportional to detect level. See the test circuit in Figure 1. VCC 68 kΩ TL331 8 L1 7 0.01 µF 1 mH 15-Cycle 49.4-kHz Variable-Amplitude Burst Generator 490 kΩ 6 21 mH 500 pF GADJ 2 XIN 1 0.0022 µF NC LC 3 5 kΩ G2IN VCC 4 R1 REC G1OUT 5 0.01 µF BIAS G1IN NC GCC GCB GCA GCD Trip Level 9 10 1000 pF 11 12 13 14 15 16 GND 5 kΩ All Resistors ±1%, 1/4 W All Capacitors ±1%, Film L1 Q > 60 at 50 kHz C1 Q > 500 at 50 kHz 15 Pulses Input Signal Trip Level Rec Output Comparator Output Figure 1. Detect-Level Measurement Circuit and Waveforms 4 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • Detect TL852 SONAR RANGING RECEIVER SLSS003 – SEPTEMBER 1983 – REVISED MARCH 1988 APPLICATION INFORMATION GAIN STEP TABLE GCD GCC GCB GCA L L L L L L L L H H H H L L L L H H H H L L L L L L H H L L H H L L H H L H L H L H L H L H L H STEP NUMBER 0 1 2 3 4 5 6 7 8 9 10 11 Receiver Gain vs Gain Step Numbers 100 70 Relative Receiver Gain 40 20 10 7 4 2 1 0.7 0.4 0.2 0.1 0 1 2 3 4 5 6 7 8 9 10 11 Gain Steps Figure 2 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 5 TL852 SONAR RANGING RECEIVER SLSS003 – SEPTEMBER 1983 – REVISED MARCH 1988 6 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof. Copyright 1998, Texas Instruments Incorporated This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components.