CXA1598S

CXA1598M/S Recording Equalizer Amplifier for Stereo Cassette Decks Description The CXA1598M/S is a bipolar IC developed for recording equalizer amplifier in analog cassette decks. Incorporating the filter circuit has eliminated the external inductor. Also, each of the six parameters required for equalizer amplifiers can be set independently with external resistance. Features • Inductor (coil) is unnecessary • The six parameters (low frequency gain, medium frequency gain, peaking gain, medium frequency compensation frequency, peaking frequency, and Q) required for recording equalizer amplifiers can be set independently with external resistance • Low frequency boost is possible with an external capacitor • Built-in recording mute function (requiring only an external time constant circuit to implement soft mute) • Built-in 2 channels • Small package Applications Recording equalizer amplifier for stereo analog cassette decks CXA1598M 24 pin SOP (Plastic) CXA1598S 22 pin SDIP (Plastic) Structure Bipolar silicon monolithic IC Absolute Maximum Ratings • Supply voltage VCC 17 V • Operating temperature Topr –20 to +75 °C • Storage temperature Tstg –65 to +150 °C • Allowable power dissipation PD (CXA1598M) 570 mW (CXA1598S) 880 mW Operating Conditions Power supply Dual power supplies (VCC – VEE) ±6.5 to 8.0 V Single power supply (VCC) 10.0 to 16.0 V Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. –1– E95131A8Y CXA1598M/S Block Diagram and Pin Configuration CXA1598M REC CAL GP CAL GH CAL REC IN2 BOOST2 REC OUT2 13 12 12 11 IREF GH GP GL 24 23 22 21 20 19 18 NC 17 16 15 14 VCC REC EQ BIAS PARAMETER CONTROL VGS REC EQ VEE 1 2 3 4 5 6 7 8 9 10 11 VCC CXA1598S REC CAL REC OUT2 REC OUT1 REC MUTE GP CAL GH CAL REC IN2 IREF BOOST2 GP GH GL 22 21 20 19 18 17 16 15 14 13 VCC REC EQ BIAS PARAMETER CONTROL VGS REC EQ VEE 1 2 3 4 5 6 7 8 9 10 –2– REC MUTE BOOST1 REC IN1 FP CAL DGND GND f×Q VEE f/Q fM VCC REC OUT1 BOOST1 REC IN1 FP CAL DGND GND f×Q VEE NC f/Q fM CXA1598M/S Pin Description Pin No. CXA CXA 1598M 1598S (Ta = 25°C, VCC = 7.0V, VEE = –7.0V) Typical pin voltage DC AC Connection pins of resistors for setting the recording equalizer amplifier parameters. ∗ Current input pins used to set the parameters for the recording equalizer amplifier. ∗ Setting currents for each parameter are generated by attaching resistors between these pins and the DGND pin. Peaking frequency calibration pin. ∗ Controlled with DC voltages of 0 to 5V. High = Peaking frequency increased Low = Peaking frequency reduced ∗ Leave this pin open when not using the peaking frequency calibration function. Symbol I/O Z (in) Equivalent circuit Description 1 1 2 3 22 23 24 1 2 3 20 21 22 fxQ f/Q fM GL GH GP 2 3 192 1.2V — O — 22 (20) 23 (21) 24 (22) 27k DGND 4 4 FP CAL 2.5V — I 54k 54k 4 19 (17) 19 17 REC CAL 2.5V — I 54k Recording level calibration pin. ∗ Controlled with DC voltages of 0 to 5V. High = Recording level gain increased Low = Recording level gain reduced ∗ Leave this pin open when not using the recording level calibration function. Connected to GND. 5 5 DGND 0.0V — I — –3– CXA1598M/S Pin No. CXA CXA 1598M 1598S Symbol Typical pin voltage DC AC I/O Z (in) Equivalent circuit Description 30k 6 6 REC MUTE 5.0V — I — 6 Recording mute ON/OFF selection pin. ∗ Recording mute is controlled with DC voltages of 0 to 5V. High = Recording mute OFF Low = Recording mute ON ∗ Soft mute and fader can be switched over by changing the time constant of the external time constant circuit. GND 50k 8 17 7 16 REC IN1 REC IN2 0.0V –18dBv I 50kΩ 8 (7) 17 (16) Recording equalizer amplifier input pin. 9 8 GND (VG) 0.0V — I — Connect to GND for positive/negative dual power supplies. VCC/2 (center potential) for a single power supply. (Connect a capacitor of 10µF or more) Connection pin of an external capacitor for low frequency boost. ∗ When low frequency boost is unnecessary, connect to GND for positive/negative dual power supplies; connect a capacitor (3.3µF or more) for a single power supply. 280 10 15 9 14 BOOST1 BOOST2 0.0V — I 9.5kΩ 4.8k 5.5k 10 (9) 15 (14) 34k 280 35.5k GND –4– CXA1598M/S Pin No. CXA CXA 1598M 1598S Symbol Typical pin voltage DC AC I/O Z (in) Equivalent circuit Description Connect to the negative power supply for positive/negative dual power supplies. Connect to GND for a single power supply. 11 10 VEE –7.0V — I — 200 12 13 11 12 REC OUT1 REC OUT2 0.0V –3.0dBv O — 50k 12 (11) 13 (12) 200 Recording equalizer amplifier output pin. 14 13 VCC 7.0V — I — Positive power supply connection pin. Reference current setting pin for monolithic filter. ∗ The reference current can be set by attaching a resistor between this pin and DGND. 192 16 15 IREF 1.2V — O — 16 (15) 27k DGND –5– CXA1598M/S Pin No. CXA CXA 1598M 1598S Symbol Typical pin voltage DC AC I/O Z (in) Equivalent circuit Description Medium frequency calibration pin. ∗ Controlled with DC voltages of 0 to 5V. High = Medium frequency level gain increased Low = Medium frequency level gain reduced ∗ Leave this pin open when not using the medium frequency calibration function. High frequency calibration pin. ∗ Controlled with DC voltages of 0 to 5V. High = High frequency level gain increased Low = High frequency level gain reduced ∗ Leave this pin open when not using the high frequency calibration function. 20 18 GH CAL 2.5V — I — 54k 20 (18) 21 (19) 21 19 GP CAL 2.5V — I — –6– CXA1598M/S Electrical Characteristics Item Conditions Standard settings RGL: 36k//510k, RGH: 62k//220k, RGP: 36k//110k, RfM: 39k//910k, Rf/Q: 47k//750k, RfxQ: 47k//620k (Ta = 25°C, VCC = 7.0V, VEE = –7.0V) Min. Typ. Max. Unit Current consumption (ICC) 10.0 13.6 17.4 mA Entire LSI Operating voltage range 1 (positive/negative dual power supplies) Operating voltage range 2 (single power supply) Recording reference output level Recording equalizer amplifier reference output level (315Hz) (This output level is the tape reference 0dB which generates magnetic flux of 250nWb/m.) ±6.5 ±7.0 ±8.0 V 10.0 14.0 16.0 V — –3.0 — dBv Recording reference input level Input level when the reference output level is 315Hz, –3.0dBv –19.8 –18.3 –16.8 dBv (For measurement, input a 315Hz, –18.0dBv signal to the REC IN pins and then measure the output level.) Input a 1kHz signal and set the output so that THD (total harmonic distortion) is 1%. RL = 2.7kΩ (Measure the distortion of a +11dB level-up signal.) Input a 1kHz, 0.0dB (reference input level) signal and measure the distortion. RL = 2.7kΩ (Measure the distortion as THD + N.) With no signal, measure the noise using the "A"-WGT filter. Rg = 5.1kΩ (The measured value is indicated as the relative value compared to the reference level.) With no signal, measure the DC offset voltage of the REC OUT pin. REC-MUTE = 0.5V (Use a 1kHz BPF.) Input a 1kHz signal (+12dB level up) and measure the attenuation when REC MUTE is on. REC-MUTE = 2.5V Input a 1kHz, 0.0dB (reference level) signal and measure the attenuation characteristics of the soft mute function. REC-CAL = 5.0V Input a 315Hz signal (–20dB level down) and measure the amount of change compared to when the REC-CAL function is at the standard setting. REC-CAL = 0.0V Input a 315Hz signal (–20dB level down) and measure the amount of change compared to when the REC-CAL function is at the standard setting. Signal handling (1kHz, THD = 1%, RL = 2.7kΩ) 11.0 11.5 — dB Recording equalizer amplifier Total harmonic distortion (1kHz, 0.0dB, RL = 2.7kΩ) S/N ratio ("A"-WGT filter) Output DC offset voltage (REC OUT pin) Mute characteristics 1 (REC-MUTE = 0.5V) — 0.12 0.6 % 57.0 65.0 — dB –500 0 500 mV — –100 –80 dB Mute characteristics 2 (REC-MUTE = 2.5V) –6.0 –4.5 –3.0 dB REC-CAL characteristics 1 (REC-CAL = 5.0V) 5.0 6.0 7.0 dB REC-CAL characteristics 2 (REC-CAL = 0.0V) –7.5 –6.5 –5.5 dB –7– CXA1598M/S Item Conditions GH-CAL = 5.0V RGH: 62k//220k, RGL • RGP: OPEN RfM: 300k, Rf/Q: 18k, RfxQ: 12k Input a 6.3kHz signal (–20dB level down) and measure the amount of change compared to when the GH-CAL function is at the standard setting. GH-CAL = 0.0V RGH: 62k//220k, RGL • RGP: OPEN RfM: 300k, Rf/Q: 18k, RfxQ: 12k Input a 6.3kHz signal (–20dB level down) and measure the amount of change compared to when the GH-CAL function is at the standard setting. GP-CAL = 5.0V RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k Input a signal (–20dB level down) and measure the amount of change compared to when the GP-CAL function is at the standard setting. GP-CAL = 0.0V RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k Input a signal (–20dB level down) and measure the amount of change compared to when the GP-CAL function is at the standard setting. FP-CAL = 5.0V Input a signal (–20dB level down) and measure the amount of change compared to when the FP-CAL function is at the standard setting. FP-CAL = 0.0V Input a signal (–20dB level down) and measure the amount of change compared to when the FP-CAL function is at the standard setting. Min. Typ. Max. Unit GH-CAL characteristics 1 (GH-CAL = 5.0V) 4.7 5.7 6.7 dB GH-CAL characteristics 2 (GH-CAL = 0.0V) –5.5 –4.5 –3.5 dB GP-CAL characteristics 1 (GP-CAL = 5.0V) 3.9 5.4 6.9 dB Recording equalizer amplifier GP-CAL characteristics 2 (GP-CAL = 0.0V) –5.8 –4.3 –2.8 dB FP-CAL characteristics 1 (FP-CAL = 5.0V) 185 200 215 % FP-CAL characteristics 2 (FP-CAL = 0.0V) fM medium frequency compensation frequency variable width fp peaking frequency variable width Peaking Q variable width GL low frequency gain variable width GH medium frequency gain variable width GP peaking gain variable width fM medium frequency compensation frequency deviation fp peaking frequency deviation 36 46 56 % 0.3 2.4 10 kHz 10 2 –5 –10 10 RGL: 36k//510k, RGH • RGP: OPEN or RGH: 62k//220k, RGL • RGP: OPEN RfM: 39k//910k, Rf/Q: 18k, RfxQ: 12k RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k 17.8 4.2 0 –3 20.5 0 50 7 8 11 30 15 kHz dB dB dB % –15 –15 0 15 % –8– CXA1598M/S Item Recording equalizer amplifier Peaking Q deviation GL low frequency gain deviation GH medium frequency gain deviation GP peaking gain deviation Input impedance Conditions RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k RGP: 36k//510k, RGH • RGP: OPEN RfM: 9.1k, Rf/Q: 18k, RfxQ: 12k RGH: 62k//220k, RGL • RGP: OPEN RfM: 300k, Rf/Q: 18k, RfxQ: 12k RGP: 36k//110k, RGL • RGH: OPEN RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k Pins 8 and 17 (CXA1598M) Pins 7 and 16 (CXA1598S) Min. –20 –0.5 –0.8 –2.0 40 Typ. Max. Unit 0 0 0 0 50 20 0.5 0.8 2.0 60 % dB dB dB kΩ Note: Unless otherwise specified, RGL, RGH, RGP, RfM, Rf/Q, and RfxQ settings are the characteristics when set to the standard settings. –9– Electrical Characteristics Measurement Circuit (CXA1598S) DC 5V Supply R26 50k R30 50k R32 50k S1 R29 1k R36∗ 5.1k R43 10k S35 S31 R39∗ 2.7k R42 S34 100 2ch S36 1ch R37∗ 27k R31 1k R34 1k S26 C14∗ 0.47µ S29 C16 100µ R1∗ 62k S2 R2∗ 36k//510k S3 C6 1µ 25V C7 1µ 25V C9 1µ 25V R3∗ 10k S4 C2 C4 0.1µ 10µ 50V S19 S21 22 21 20 19 17 16 15 14 12 18 13 S22 S24 C11 2.2µ 50V C18 4.7µ 50V R4∗ 110k DC A Ammeter S5 R5∗ 62k//220k R25∗ 36k// 300k DC Voltmeter "A" WTG S41 DIN Audio S40 1kHz BPF 2ch S37 1ch S39 Noise Filter S6 R6∗ 6.8k S7 R7∗ 100k Power Supply S8 R8∗ 36k//110k GP GH GL GP CAL REC IN2 GND f/Q fM Power Supply 1 2 3 7 4 8 5 6 S20 S12 R14∗ 47k//750k f×Q FP CAL DGND REC MUTE REC IN1 GND BOOST1 VEE REC OUT1 REC OUT2 BOOST2 VCC – 10 – CXA1598S 9 10 S18 C3 10µ 50V R24∗ 36k// 300k C10 2.2µ 50V C1 0.1µ R28 1k C5 1µ 25V R33 1k C8 1µ 25V R35∗ 5.1k C12 100µ 25V S25 C13∗ 0.47µ S27 S28 R27 50k S23 R11∗ 160k S11 R12∗ 160k R13∗ 39k REC CAL S10 GH CAL R10∗ 39k IREF S9 R9∗ 6.8k R23∗ 620 R15∗ 47k//620k S13 R16∗ 5.1k 11 C17 4.7µ 50V R41 100 S33 R38∗ 2.7k S30 R40 S32 10k C15 100µ OUT S38 Filter IN AC Voltmeter Distortion Analyzer Oscilloscope DC Ammeter A R17∗ 33k S14 R18∗ 18k R19∗ 12k S15 R20∗ 300k Note. 1. Resistor tolerance 2. Capacitor tolerance Coupling Capacitor S16 R21∗ 39k//910k S17 R22∗ 9.1k ±5% ∗: ±1% ±5% ∗: ±2% ±10% Audio SG CXA1598M/S Electrical Characteristics Measurement Circuit (CXA1598M) DC 5V Supply R26 50k R30 50k R32 50k S1 R29 1k S26 S29 R43 10k S35 2ch S36 1ch S31 R39∗ 2.7k R42 S34 100 R36∗ 5.1k R37∗ 27k C16 100µ R31 1k R34 1k C14∗ 0.47µ R1∗ 62k S2 R2∗ 36k//510k S3 C2 C4 0.1µ 10µ 50V S19 S21 24 22 23 17 21 20 19 18 16 15 13 14 S22 S24 C11 2.2µ 50V C18 4.7µ 50V R25∗ 36k// 300k C6 1µ 25V C7 1µ 25V C9 1µ 25V R3∗ 10k S4 R4∗ 110k DC Ammeter A S5 R5∗ 62k//220k DC Voltmeter "A" WTG S41 DIN Audio S40 1kHz BPF S6 R6∗ 6.8k S7 R7∗ 100k Power Supply S8 R8∗ 36k//110k GL GP GH NC IREF VCC S9 R9∗ 6.8k R23∗ 620 GH CAL REC IN2 BOOST2 S10 CXA1598M GP CAL R10∗ 39k 2ch S37 Noise Filter 1ch S39 GND R11∗ 160k FP CAL DGND REC MUTE REC CAL NC REC IN1 GND BOOST1 VEE f×Q f/Q Power Supply 1 2 3 S20 7 8 4 9 5 6 10 S12 R14∗ 47k//750k fM REC OUT1 REC OUT2 – 11 – 11 S18 C3 10µ 50V R24∗ 36k// 300k C10 2.2µ 50V C1 0.1µ R28 1k R33 1k C5 1µ 25V C8 1µ 25V C13∗ 0.47µ R35∗ 5.1k C12 100µ 25V S25 S27 S28 R27 50k S23 S11 R12∗ 160k R13∗ 39k R15∗ 47k//620k DC Ammeter A S13 R16∗ 5.1k 12 C17 4.7µ 50V R41 100 S33 R38∗ 2.7k S30 R40 S32 10k C15 100µ OUT S38 Filter IN AC Voltmeter Distortion Analyzer Oscilloscope R17∗ 33k S14 R18∗ 18k R19∗ 12k S15 R20∗ 300k Note. 1. Resistor tolerance 2. Capacitor tolerance Coupling Capacitor S16 R21∗ 39k//910k S17 R22∗ 9.1k ±5% ∗: ±1% ±5% ∗: ±2% ±10% Audio SG CXA1598M/S Application Circuit for Positive/Negative Dual Power Supplies (CXA1598S) GP CAL (DC CONTROL) GH CAL (DC CONTROL) REC CAL (DC CONTROL) LINE IN2 R38 10k GP R36 R35 22 21 20 17 16 15 14 19 18 13 C2 3.3µ 50V R44 27k C4 0.47µ GND 12 R40 R42 10k 5.6k C5 100µ 25V GND VCC GND C8 3.3µ C10 50V 150p R46 12k L2 27mH fM R6 f/Q R12 f×Q R18 GL R24 GH R30 REC OUT2 (to HEAD) R5 R11 R17 R23 R29 GP GH GL IREF GP CAL CXA1598S R32 BOOST2 R3 R9 R15 R21 R27 REC IN2 R33 GH CAL TYPEI R4 NORMAL VCC R10 R16 R22 R28 R34 C12 75p BIAS OSC f×Q f/Q fM FP CAL DGND REC MUTE REC CAL TYPEIV METAL C1 3.3µ 50V 1 2 3 4 5 6 REC IN1 GND BOOST1 7 R41 5.6k R39 10k R37 10k 8 9 C3 0.47µ 10 VEE C5 100µ 25V 11 REC OUT1 REC OUT2 FP CAL (DC CONTROL) REC MUTE (SOFT MUTE/FADER) LINE IN1 – 12 – R31 GND TYPEII CrO2 R2 R8 R14 R20 R26 R1 R7 R13 R19 R25 C11 75p R45 12k C7 C9 3.3µ 150p 50V GND GND VEE GND L1 27mH GND REC OUT1 (to HEAD) HIGH SPEED NORMAL SPEED CXA1598M/S Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Application Circuit for Positive/Negative Dual Power Supplies (CXA1598M) GP CAL (DC CONTROL) GH CAL (DC CONTROL) REC CAL (DC CONTROL) LINE IN2 R38 10k GP R36 R35 24 22 23 17 21 20 18 16 15 19 C2 3.3µ 50V R44 27k 14 C4 0.47µ GND 13 R40 R42 10k 5.6k C5 100µ 25V GND VCC GND C8 3.3µ C10 50V 150p R46 12k L2 27mH fM R6 f/Q R12 f×Q R18 GL R24 GH R30 REC OUT2 (to HEAD) R5 R11 R17 R23 R29 GP GH GL NC GH CAL REC IN2 CXA1598M BOOST2 R3 R32 R9 R15 R21 R27 R33 GP CAL IREF TYPEI R4 NORMAL R34 VCC R10 R16 R22 R28 C12 75p BIAS OSC C11 75p f×Q f/Q fM FP CAL DGND REC MUTE REC CAL NC REC IN1 GND BOOST1 TYPEIV METAL 1 2 3 4 5 6 7 C1 3.3µ 50V 8 R41 5.6k R39 10k 9 10 11 C3 0.47µ VEE C5 100µ 25V 12 REC OUT1REC OUT2 FP CAL (DC CONTROL) CXA1598M/S Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. REC MUTE (SOFT MUTE/FADER) LINE IN1 – 13 – R31 R37 10k GND TYPEII CrO2 R2 R8 R14 R20 R26 R1 R7 R13 R19 R25 R45 12k C7 C9 3.3µ 150p 50V GND GND VEE GND L1 27mH REC OUT1 (to HEAD) HIGH SPEED GND NORMAL SPEED Application Circuit for a Single Power Supply (CXA1598S) GP CAL (DC CONTROL) GH CAL (DC CONTROL) REC CAL (DC CONTROL) LINE IN2 R38 10k GP R36 R35 22 21 20 17 16 15 14 19 18 13 C2 3.3µ 50V R44 27k C4 0.47µ GND 12 R40 R42 10k 5.6k C5 100µ 25V GND VCC GND C8 3.3µ C10 50V 150p R46 12k L2 27mH fM R6 f/Q R12 f×Q R18 GL R24 GH R30 REC OUT2 (to HEAD) R5 R11 R17 R23 R29 GP GH GL IREF GP CAL GH CAL CXA1598S R32 BOOST2 R3 R9 R15 R21 R27 R33 REC IN2 TYPEI R4 NORMAL VCC R10 R16 R22 R28 R34 C12 75p BIAS OSC TYPEII CrO2 R2 R8 R14 R20 R26 f×Q f/Q fM FP CAL DGND REC MUTE REC CAL TYPEIV METAL C1 3.3µ 50V 1 2 3 4 5 6 REC IN1 GND BOOST1 7 R41 5.6k R39 10k R37 10k 8 C1 10µ 25V 9 C3 0.47µ 10 VEE 11 REC OUT1 REC OUT2 FP CAL (DC CONTROL) REC MUTE (SOFT MUTE/FADER) LINE IN1 – 14 – R31 GND R1 R7 R13 R19 R25 C11 75p R45 12k C7 C9 3.3µ 150p 50V GND GND GND L1 27mH GND REC OUT1 (to HEAD) HIGH SPEED NORMAL SPEED CXA1598M/S Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. Application Circuit for a Single Power Supply (CXA1598M) GH CAL (DC CONTROL) REC CAL (DC CONTROL) GP CAL (DC CONTROL) LINE IN2 R38 10k GP R36 R35 24 22 23 21 20 19 17 18 16 15 C2 3.3µ 50V R44 27k C4 0.47µ 14 R40 R42 10k 5.6k GND C5 100µ 25V VCC GND C8 3.3µ C10 50V 150p L2 27mH REC OUT2 (to HEAD) fM R6 f/Q R12 f×Q R18 GL R24 GH R30 R5 R11 R17 R23 R29 GND 13 R46 12k GP GL GH NC GP CAL REC IN2 CXA1598M BOOST2 R3 R32 R9 R15 R21 R27 R33 GH CAL IREF TYPEI R4 NORMAL VCC R10 R16 R22 R28 R34 C12 75p BIAS OSC REC MUTE REC CAL BOOST1 DGND VEE REC IN1 f×Q f/Q fM FP CAL TYPEIV METAL 1 2 3 7 4 5 6 NC GND 8 C1 3.3µ 50V R41 5.6k R39 10k 9 C1 10µ 25V 10 11 C3 0.47µ 12 REC OUT1REC OUT2 FP CAL (DC CONTROL) CXA1598M/S Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. REC MUTE (SOFT MUTE/FADER) LINE IN1 – 15 – R31 R37 10k GND TYPEII CrO2 R2 R8 R14 R20 R26 R1 R7 R13 R19 R25 C11 75p R45 12k C7 C9 3.3µ 150p 50V GND GND GND L1 27mH REC OUT1 (to HEAD) HIGH SPEED GND NORMAL SPEED CXA1598M/S Description of Operation 1. Recording equalizer amplifier The primary features of the CXA1598 recording equalizer amplifier are that by taking full advantage of monolithic filter technology, an LC resonance circuit consisting of a coil and capacitor normally required for high frequency compensation is dispensed with and medium and low frequency sensitivity compensation is performed with its internal filter alone. In addition, the six parameters (low frequency gain, medium frequency gain, peaking gain, medium frequency compensation frequency, peaking frequency, and Q) required for recording equalizer amplifiers can be set as desired simply by attaching resistors to the GL, GH, GP, fM, f/Q, and fxQ pins. This IC has the circuit configuration shown in Fig. 1 to provide the optimum frequency response required for recording equalizer amplifiers. GND From LINE IN C2 0.47µ BOOST R2 8.2k R1 10k R15 4.8k 0dBv C1 2.2µ R10 50k VGS R11 5k VCC VEE GND R9 27k DGND DGND VCC VEE GND IREF DGND BIAS VGS OP2 R17 20k R16 20k –6dBv ×1 C4 100p GND REC MUTE VGS R18 8k –6dBv R19 24k Gm2 C5 100p GND R8 RGL DGND R7 RGH R6 RGP R5 RfM R4 Rf/Q R3 Rf × Q GH GP fM f/Q f×Q CONTROL PARAMETER GL REC CAL +6dBv CALIBRATION Gm3 VGS DGND GH CAL GP CAL FP CAL R22 50k R24 50k R25 50k R26 50k ×1 DVCC R14 34k OP1 R12 35k R13 5.5k Gm1 –7dBv GND C3 200p ×1 C8 75p –3dBv OP3 R21 50k C6 R23 3.3µ 12k C7 150p GND 27mH REC HEAD BIAS OSC R20 –7dBv 40k Gm4 REC OUT REC IN –18dBv GND GND GND to Control IC Fig. 1. CXA1598M/S functional circuit block diagram 2. Low frequency boost The CXA1598 implements low frequency boost simply by attaching an external capacitor to the BOOST pins. Signals are boosted by approximately 6dB. The boost cut-off frequency can be freely set with the value of the external capacitor. Gain [dB] 6dB oct f1 f2 Frequency [Hz] Fig. 2. CXA1598M/S low frequency boost frequency response – 16 – CXA1598M/S 3. Recording mute function The CXA1598 contains a built-in recording mute circuit which varies the recording equalizer amplifier gain according to the magnitude of the DC voltage applied to the REC MUTE pin just like an electronic volume control. Also, any desired soft mute or fader can be freely set depending on momentary changes in the DC voltage applied to the REC MUTE pin. Fig. 3 illustrates the recording mute waveforms. Fig. 3. Recording mute waveform 4. Recording level calibration function The CXA1598 allows the recording level to be finely adjusted with a DC voltage. The recording equalizer amplifier gain can be varied by approximately ±5dB simply by applying a DC voltage to the REC CAL pin. When not using the recording level calibration function, simply leave the REC CAL pin open, and the REC CAL pin is matched to the internal reference voltage (2.5V), with the recording level set for the standard output gain. 5. Medium frequency equalizer amplifier calibration function The CXA1598 allows the medium frequency equalizer amplifier characteristics to be finely adjusted with a DC voltage. By simply applying a DC voltage to the GH CAL pin, the medium frequency equalizer amplifier gain can be varied by approximately ±4dB. When not using this calibration function, simply leave the GH CAL pin open, and the GH CAL pin is matched to the internal reference voltage (2.5V), with the medium frequency equalizer amplifier characteristics set for the standard output gain. 6. High frequency equalizer amplifier calibration function The CXA1598 allows the high frequency equalizer amplifier characteristics to be finely adjusted with a DC voltage. By simply applying a DC voltage to the GP CAL pin, the high frequency equalizer amplifier gain can be varied by approximately ±4dB. Also, when not using this calibration function, simply leave the GP CAL pin open, and the GP CAL pin is matched to the internal reference voltage (2.5V), with the high frequency equalizer amplifier characteristics set for the standard output gain. 7. fp peaking frequency calibration function The CXA1598 allows the fp peaking frequency to be finely adjusted with a DC voltage. By simply applying a DC voltage to the FP CAL pin, the fp peaking frequency can be varied by approximately 46% to 200%. Also, when not using this calibration function, simply leave the FP CAL pin open, and the FP CAL pin is matched to the internal reference voltage (2.5V), with the fp peaking frequency response set for the standard fp peaking frequency. – 17 – CXA1598M/S FP CAL GP CAL REC CAL GP CAL Gain [dB] GP CAL REC CAL REC CAL REC CAL GH CAL GH CAL REC CAL GH CAL fp Frequency [Hz] Fig. 4. Conceptual diagram of recording level/medium frequency equalizer amplifier/high frequency equalizer amplifier/fp peaking frequency calibration functions Control Voltage for Each Control Pin Pin NO. 4 (4) 6 (6) 17 (19) 18 (20) 19 (21) Pin Name Pin voltage [V], referenced to DGND 0.0 0.5 2.5 4.5 5.0 Remarks Amount of fp peaking frequency change [%] compared to when FP CAL is at the standard setting. REC OUT attenuation [dB] compared to when REC MUTE is at the standard setting. f = 1kHz Amount of change [dB] compared to when REC CAL is at the standard setting. f = 315Hz Amount of GH medium frequency gain change [dB] compared to RGH standard. RGL, RGP: OPEN Amount of GP peaking frequency gain change [dB] compared to RGP standard. RGL, RGH: OPEN Reduce < < < < < < < < Increase FP CAL 46 REC MUTE — REC CAL –6.5 GH CAL –4.5 GP CAL –4.2 — — — 5.4 — — — 5.7 Reduce < < < < < < < < Increase — — — 6.0 Reduce < < < < < < < < Increase –100 –4.5 — — Reduce < < < < < < < < Increase — — — 200 Reduce < < < < < < < < Increase – 18 – CXA1598M/S 8. Mode control methods Refer to the application circuits shown in Figs. 5 and 6 for mode control methods using a manual switch. When tape mode is implemented with logic, use the same ground for the 27kΩ resistance connected to the common pin (analog switch connection) of the used analog switch IC and to the DGND and IREF pins. Figs. 5 and 6 show examples when using the 4051B (8-channel multiplexer/demultiplexer). VDD fM R6 14 26 3 COM VDD 16 2 15 1 14 R3 f/Q R12 f×Q R18 GL R24 GH R30 GP R36 R44 27k R5 R11 R17 R23 R29 R35 22 21 20 15 R4 R10 R16 R22 R28 R34 R9 R15 R21 R27 R33 CXA1598S 4051B 47 55 6 VEE INH 0 13 R2 3 12 R1 A 11 B 10 C9 R7 R13 R19 R25 R31 R8 R14 R20 R26 R32 f×Q f/Q 1 fM 2 3 7 VEE 8 VSS GND SPEED HIGH/NORM TYPEIV/I, II 70µs/120µs Fig. 5. For positive/negative dual power supplies VDD fM R6 14 26 3 COM VDD 16 2 15 1 14 R3 f/Q R12 f×Q R18 GL R24 GH R30 GP R36 R44 27k R5 R11 R17 R23 R29 R35 22 21 20 15 R4 R10 R16 R22 R28 R34 R9 R15 R21 R27 R33 CXA1598S 4051B 47 55 6 INH 0 13 R2 3 12 R1 A 11 B 10 C9 R7 R13 R19 R25 R31 R8 R14 R20 R26 R32 f×Q f/Q 1 fM 2 3 7 VEE 8 VSS GND SPEED HIGH/NORM TYPEIV/I, II 70µs/120µs Fig. 6. For a single power supply 9. Temperature characteristics and accuracy of the recording equalizer amplifier The temperature and cut-off frequency of the CXA1598 depend on the external resistance connected to the IREF, GL, GH, GP, fM, f/Q, and fxQ pins. For low frequency boost, however, the cut-off frequency becomes uneven depending on the temperature characteristics or unevenness of the internal resistance since its time constant is configured by the product of an external capacitor and the internal resistance. Also, the recording equalizer amplifier frequency response depends on unevenness in the absolute, as well as relative values of the internal capacitance. Furthermore, the high frequency response indicates a high element sensitivity at the filter because the band-pass filter Q is high. Compared to low frequency, although the unevenness inherent in the IC is more likely to occur, this occurs relatively, and not individually for channels 1 and 2. – 19 – DGND 5 IREF GH GP GL DGND 5 IREF GH GP GL CXA1598M/S Notes on Operation 1. Power supply The CXA1598 is designed basically for positive/negative dual power supplies, and can also operate with a single power supply. Connect the power supplies for each case as shown below: VCC 14pin (13pin) VEE 11pin (10pin) GND 9pin (8pin) DGND 5pin (5pin) GND —∗ GND GND Positive/negative Positive power supply Negative power supply dual power supplies Single power supply Power supply GND Pin Nos. in parentheses are those for the CXA1598S. ∗ For a single power supply, connect a decoupling capacitor (10µF or more) to the GND (VG) pin. The ripple rejection ratio depends on the capacitance of this capacitor. 2. Low frequency boost The CXA1598 can implement low frequency boost simply by connecting a capacitor to the BOOST pins. Although the boost is fixed to 6dB, the time constant which determines the cut-off frequency can be set to any desired value depending on the external capacitor. The pole (f1) and zero (f2) shown in Fig. 3. Low frequency boost frequency response can be expressed, with the external capacitor assumed to be CB, as follows: f1 = R13 + R14 2π • CB • (R13 • R14 + R14 • R15 + R15 • R13) 1 1 = [Hz] 2π • CB • (R13 • R14 / (R13 + R14) + R15) 2π • CB • (9.53kΩ) 1 1 = [Hz] 2π • CB • (4.8kΩ) 2π • CB • R15 = = When not using low frequency boost, follow the procedure described below. For positive/negative dual power supplies Connect the BOOST pins to GND. For single power supply Connect a fairly large capacitor (3.3µF or more) to the BOOST pins or simply leave the BOOST pins open. If the BOOST pins are left open, note that the output level increases by 6dB, so the input level should be set 6dB down. The CXA1598 is basically designed for positive/negative dual power supplies and the BOOST pins cannot be easily connected to GND as in the case of positive/negative dual power supplies. 3. Resistance connected to the IREF pin as well as the GL, GH, GP, fM, f/Q, and fxQ pins The recording equalizer amplifier frequency response is determined by the resistance connected to the IREF pin as well as the GL, GH, GP, fM, f/Q, and fxQ pins. This means that the accuracy of the recording equalizer amplifier frequency response is determined by the resistance connected to these pins. Therefore, the resistors used for this purpose must be free of unevenness and have excellent temperature characteristics (e.g., a metallic film resistor). – 20 – CXA1598M/S Example of Representative Characteristics RGL gain characteristics 20 15 10 5 VCC, VEE = ±7V RGH OPEN RGP OPEN RfM 9.1k Rf/Q 18k Rf × Q 12k 0dB = 315Hz, –23dBv (–20dB) f = 1kHz 20 15 10 5 VCC, VEE = ±7V RGH OPEN RGP OPEN RfM 300k Rf/Q 18k Rf × Q 12k 0dB = 315Hz, –23dBv (–20dB) f = 1kHz RGH gain characteristics 0 –5 –10 –15 –20 –25 1k 10k GH [dB] GL [dB] 0 –5 –10 –15 –20 100k RGL [Ω] 1M –25 1k 10k RGH [Ω] 100k 1M RGP gain characteristics 40 35 30 25 VCC, VEE = ±7V RGL OPEN RfM 300k Rf/Q 47k//750k Rf × Q 47k//620k 0dB = 315Hz, –23dBv (–20dB) RGH OPEN RGH 31.5k 100k RfM cut-off frequency characteristics VCC, VEE = ±7V RGL 36k//510k RGH OPEN RGP OPEN Rf/Q 18k Rf × Q 12k 10k GP [dB] 15 10 5 0 –5 1k 10k RGP [Ω] 100k 1M fM [Hz] 1k 100 1k 20 10k RfM [Ω] 100k 1M Rf/Q cut-off frequency characteristics 100k VCC, VEE = ±7V RGL OPEN RGH OPEN RGP 36k//110k RfM 300k Rf × Q 37.4k 1M RfxQ cut-off frequency characteristics VCC, VEE = ±7V RGL OPEN RGH OPEN RGP 36k//110k RfM 300k Rf/Q 38.6k 10k 100k 1k f × Q [Hz] 10k 100 1k 10k Rf/Q [Ω] 100k 1M 1k 1k f/Q [Hz] 10k Rf × Q [Ω] 100k 1M – 21 – CXA1598M/S Output level vs. Mute characteristics 1 14 100 Current consumption vs. Supply voltage ICC IEE ICC/IEE [mA] 13 Positive/negative dual power supplies RGL 36k//510k RGH 62k//220k RGP 36k//110k RfM 39k//910k Rf/Q 47k//750k Rf × Q 47k//620k 3 4 5 6 7 8 9 10 11 80 12 Output level [%] 60 11 40 VCC, VEE = ±7V RGL 36k//510k RGH 62k//220k RGP 36k//110k RfM 39k//910k Rf/Q 47k//750k Rf × Q 47k//620k 100% = 1kHz, +12dB (at 315Hz, –3dBv) f = 1kHz Supply voltage [V] 20 0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 REC MUTE pin voltage [V] Output level vs. Mute characteristics 2 0 0 Output level vs. Mute characteristics 3 –20 –20 Output level [dB] –40 Output level [dB] –40 VCC, VEE = ±7V RGL 36k//510k RGH 62k//220k RGP 36k//110k RfM 39k//910k Rf/Q 47k//750k Rf × Q 47k//620k 0dB = 1kHz, +12dB (at 315Hz, –3dBv) f = 1kHz 0.5 1.0 5.0 10.0 –60 –80 –100 0.0 1.0 2.0 VCC, VEE = ±7V RGL 36k//510k RGH 62k//220k RGP 36k//110k RfM 39k//910k Rf/Q 47k//750k Rf × Q 47k//620k 0dB = 1kHz, +12dB (at 315Hz, –3dBv) f = 1kHz –60 –80 REC MUTE pin voltage [V] 3.0 4.0 5.0 6.0 7.0 REC MUTE pin voltage [V] – 22 – CXA1598M/S Total harmonic distortion 10 VCC, VEE = ±7V RGL 36k//510k RGH 62k//220k RGP 36k//110k RfM 39k//910k Rf/Q 47k//750k Rf × Q 47k//620k 0dB = –3dBv RL = 2.7kΩ 315Hz 1kHz 3kHz 6.3kHz 10kHz 15kHz 15 Load characteristics Maximum output level [dB] 10 1.0 5 0 100 0.1 1k VCC, VEE = ±7V RGL 36k//510k RGH 62k//220k RGP 36k//110k RfM 39k//910k Rf/Q 47k//750k Rf × Q 47k//620k 0dB = –3dBv THD + N = 1% 315Hz 1kHz 10k T. H. D + N [%] RL – load resistance [Ω] –10 0 Output level [dB] 10 20 Output level vs. REC CAL voltage 8 6 4 VCC, VEE = ±7V RGL 36k//510k RGH 62k//220k RGP 36k//110k RfM 39k//910k Rf/Q 47k//750k Rf × Q 47k//620k 0dB = REC CAL pin 2.5V, –20dB (at 315Hz, –3dBv) 315Hz 8kHz Output level [dB] 2 0 –2 –4 –6 –8 –2.0 –1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 REC CAL pin voltage [V] – 23 – CXA1598M/S Output level vs. GH CAL voltage 6 4 2 3kHz 8kHz 12kHz 3kHz Setting 1 Setting 2 Output level [dB] 0 –2 –4 –6 VCC, VEE = ±7V Setting 1 Setting 2 RGL 36k//510k RGL OPEN RGH 62k//220k RGH 62k//220k RGP 36k//110k RGP OPEN RfM 39k//910k RfM 300k Rf/Q 47k//750k Rf/Q 18k Rf × Q 47k//620k Rf × Q 12k 0dB = GH CAL pin 2.5V, –20dB (at 315Hz, –3dBv) –2.0 –1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 GH CAL pin voltage [V] Output level vs. GP CAL voltage 6 4 2 3kHz 8kHz 12kHz 12kHz Setting 1 Setting 2 Output level [dB] 0 –2 –4 –6 VCC, VEE = ±7V Setting 1 Setting 2 RGL 36k//510k RGL OPEN RGH 62k//220k RGH OPEN RGP 36k//110k RGP 36k//110k RfM 39k//910k RfM 300k Rf/Q 47k//750k Rf/Q 47k//750k Rf × Q 47k//620k Rf × Q 47k//620k 0dB = Gp CAL pin 2.5V, –20dB (at 315Hz, –3dBv) –2.0 –1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Gp CAL pin voltage [V] fp peaking frequency vs. FP CAL pin voltage fp peaking frequency variation ratio [%] 220 180 140 100 60 20 VCC, VEE = ±7V fp peaking frequency 100% when FP CAL pin is 2.5V RGL OPEN RGH OPEN RGP 36k//110k RfM 300k Rf/Q 47k//750k Rf × Q 47k//620k –2.0 –1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 FP CAL pin voltage [V] – 24 – CXA1598M/S REC CAL and GH CAL frequency response VCC, VEE = ±7V 30 0dB = 315Hz, –23dBv (–20dB), REC CAL, GH CAL, GP CAL, FP CAL = 2.5V Output response [dB] 20 GH CAL 5.0V 2.5V 0.0V 5.0V f1 f4 f7 REC CAL 2.5V f2 f5 f8 0.0V f3 f6 f9 f1 f7 f2 f4 f5 f6 10 0 f3 –10 10 100 f9 1k f8 10k 100k Frequency [Hz] REC CAL and GP CAL frequency response VCC, VEE = ±7V 30 0dB = 315Hz, –23dBv (–20dB), REC CAL, GH CAL, GP CAL, FP CAL = 2.5V Output response [dB] 20 GP CAL 5.0V 2.5V 0.0V f4 f7 5.0V f1 f5 f8 REC CAL 2.5V f2 f6 f9 0.0V f3 f1 f2 f3 f7 f8 f9 100 1k Frequency [Hz] 10k 100k f4 f5 f6 10 0 –10 10 REC CAL and FP CAL frequency response VCC, VEE = ±7V 30 0dB = 315Hz, –23dBv (–20dB), REC CAL, GH CAL, GP CAL, FP CAL = 2.5V f1 f2 f3 f7 f8 f9 f4 f5 f6 Output response [dB] 20 FP CAL 5.0V 2.5V 0.0V 5.0V f1 f4 f7 REC CAL 2.5V f2 f5 f8 0.0V f3 f6 f9 10 0 –10 10 100 1k Frequency [Hz] 10k 100k – 25 – CXA1598M/S Package Outline CXA1598M Unit: mm 24PIN SOP (PLASTIC) + 0.4 15.0 – 0.1 24 13 + 0.4 1.85 – 0.15 0.15 + 0.3 5.3 – 0.1 7.9 ± 0.4 + 0.2 0.1 – 0.05 0.45 ± 0.1 1.27 + 0.1 0.2 – 0.05 ± 0.12 M PACKAGE STRUCTURE MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SOP-24P-L01 ∗SOP024-P-0300-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY/PHENOL RESIN SOLDER PLATING COPPER ALLOY / 42ALLOY 0.3g CXA1598S 22PIN SDIP (PLASTIC) + 0.1 0.05 0.25 – 12 + 0.4 19.2 – 0.1 22 + 0.3 6.4 – 0.1 1 1.778 11 0.5 ± 0.1 + 0.15 0.9 – 0.1 + 0.15 3.25 – 0.2 0.51 MIN + 0.4 3.9 – 0.1 PACKAGE STRUCTURE MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SDIP-22P-01 SDIP022-P-0300 LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER PLATING COPPER ALLOY 0.95g – 26 – 7.62 0.5 ± 0.2 0° to 15° 1 12 6.9