CXA2500M/N Dual REC/PB Preamplifier Description The CXA2500M/N is a dual recording/playback preamplifier system bipolar IC which has been developed for the low voltage operating cassette tape recorder. CXA2500M 24 pin SOP (Plastic) Features • Low quiescent current (VCC = 2V) PB: ICC = 3.2mA (typ.) REC: ICC = 5.2mA (typ.) • Very few external parts • Built-in Metal/Normal selection switch • Small switching noise due to internal transient muting CXA2500N 24 pin SSOP (Plastic) Absolute Maximum Ratings (Ta = 25°C) • Supply voltage VCC 7 • Operating temperature Topr –20 to +75 • Storage temperature Tstg –65 to +150 • Allowable power dissipation PD Applications 3V headphone radio cassette recorders CXA2500M CXA2500N Structure Bipolar silicon monolithic IC 600 470 Operating Conditions Supply voltage PB REC MIC INPUT (B) PB PRE INPUT (B) PB NF (B) PB OUTPUT (A) PB EQ SWITCH (B) TUNER INPUT (B) LINE OUTPUT (B) REC DRIVE INPUT (B) REC DRIVE OUTPUT (B) VCC PB/REC SELECTOR 24 23 22 21 20 19 18 17 16 15 14 13 PB GCA MIC V V PB/ REC REC LINE mW mW 1.2 to 3.5 1.6 to 3.5 GROUND Bock Diagram VCC VCC V °C °C AMP AGC NORM/ METAL AGC DET REF AMP LINE 12dB PB 6 PB PRE INPUT (A) PB NF (A) PB OUTPUT (A) PB EQ SWITCH (A) 7 8 9 10 11 12 TAPE/TUNER SELECTOR 5 AGC TIME CONSTANT 4 REC DRIVE OUTPUT (A) 3 REC DRIVE INPUT (A) 2 20.5dB LINE OUTPUT (A) 1 TAPE/ TUNER REC –0.3dB MIC INPUT (A) 22dB REFERENCE 6dB GCA TUNER INPUT (A) MIC 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– E94806B8Y CXA2500M/N Pin Description No. Symbol Pin voltage is during VCC = 2V Voltage (Typ.) Equivalent circuit Description VCC 2 23 MIC IN (A) MIC IN (B) 0.93V 510 2 20k MIC preamplifier input 23 10k 20k Vref VCC 3 22 PB PRE IN (A) PB PRE IN (B) 510 0.93V Vref 22 PB preamplifier input 3 VCC 4 21 PB-NF (A) PB-NF (B) 0.93V 510 510 Vref 21 PB equalizer circuit negative feedback 4 VCC 5 20 PB OUT (A) PB OUT (B) 0.93V 20 PB preamplifier output 5 VCC 6 19 PB EQ SW (A) PB EQ SW (B) 0.93V 19 6 –2– PB equalizer switch CXA2500M/N No. Symbol Voltage (Typ.) Equivalent circuit Description VCC 40k 7 18 TUNER IN (A) TUNER IN (B) 0.93V 40k Tuner input 18 7 4k Vref VCC 8 17 LINE OUT (A) LINE OUT (B) 40k 142 17 0.58V Line amplifier output 8 VCC 9 16 REC AMP IN (A) REC AMP IN (B) 0.93V REC drive input 16 9 10k 4k Vref VCC 10 15 REC AMP OUT (A) REC AMP OUT (B) 15 1.0V 10 REC drive output VCC 1 REF 1 0.93V –3– Reference voltage output CXA2500M/N No. Symbol Voltage (Typ.) Equivalent circuit Description VCC 11 AGC TC 1k 0.37V AGC time constant 11 VCC 150k 142 12 TAPE/TUNER 0.5V (Open) 12 50k Tape/tuner selection During Tape/Normal: 0V During Tape/Metal: 0.5V During Tuner Mode: 2.0V VCC 142 13 PB/REC 0V (2.0V) 13 –4– PB/REC selection During PB = 0V During REC = 2.0V Icq1 Icq2 Icq3 Icq4 Vref Tape playback quiescent current MIC recording quiescent current Radio playback quiescent current Radio pecording quiescent current Reference voltage S3 –5– A B B B B OFF OFF A OFF C PB ON B Ripple rejection RR A A A A A A B B B B B B B B B B B B B B B B B B B B B B B B ON ON ON ON ON OFF OFF ON ON ON ON ON A A A A A A OFF OFF OFF OFF OFF OFF C C C C B C PB PB PB PB PB PB ON ON ON ON ON ON A A A A A A Vno A Output noise voltage B A A A A Vom B B B B B A Maximum output voltage A B B B B B THD A B B B B B Total harmonic distortion ON B B B B B CB ON OFF OFF OFF OFF OFF OFF OFF OFF B S9 Channel balance A A S8 OFF OFF S7 Gvc2 OFF OFF A A A A S6 Close loop voltage gain 2 C C OFF OFF OFF OFF S5 Gvc1 PB PB A A C C S4 Close loop voltage gain 1 ON ON OFF REC OFF PB OFF REC OFF PB S2 V1 Io Io Io Io 2.8 4.2 1.3 Vcc = 2.0V No signal, Tuner Vcc = 2.0V 2.8 No signal, Tuner Rec e8, e17 fr = 100Hz Vr = –30dBm e8, e17 Rg = 2.2kΩ e8, e17 THD = 1% dBm e8, e17 Vo = –15dBm dBm e8, e17 Vo = –15dBm dBm e8, e17 Vo = –15dBm dBm e8, e17 Vo = –15dBm 6.2 4.7 7.2 5.5 65 — 72 27.5 35 — +2.0 — 125 — 0.3 1.05 0 190 300 — –2.0 25.5 27.2 29.0 28.5 30.8 33.0 54 0.78 0.93 1.05 5.2 Vcc = 2.0V 3.8 No signal, Mic Rec Vcc = 2.0V No signal, Tape 3.2 dB µV mV % dB V mA Min. Typ. Max. Unit 1.8 Vcc = 2.0V No signal, Tape dBm e8, e17 Vo = –15dBm Input condition Measurement conditions VCC = 2.0V, f = 1kHz, Ta = 25°C, unless otherwise specified. Measure -ment S10 S11 S12 S13 Vin1 Vin2 Vin3 Unit point Gvo A A A A A A S1 SW condition Open loop voltage gain (1) PLAYBACK MODE Symbol Item Electrical Characteristics CXA2500M/N Symbol S1 –50 A B B B B OFF OFF A OFF A ON REC B Ripple rejection RR –6– Vo ALC CB ALC ALC voltage ALC balance Ripple rejection RR W ALC ALC width B A A A A Vno Output noise voltage A A CB Channel balance Total harmonic THD distortion Gvc Voltage gain (3) MIC RECORDING: - A A B B B B A B B B B OFF OFF A OFF C ON REC –60 A B B B B OFF OFF B ON C ON REC –2 –5 fr = 100Hz Vr = –30dBm e10, e15 — 4.7 4.5 1.5 dB mV % dB dB µV mV % dB 3 0 — +2 dB 230 340 470 mV dBm e10, e15 Vin = –60dBm dBm e10, e15 Vin = –60dBm –60 A B B B OFF OFF B ON C ON REC — B B B OFF OFF B ON C ON REC 39 1.5 0 A — –1.5 B B B B — 58.5 61.8 65.0 B dBm e10, e15 Vin = –50dBm dBm e10, e15 Vo = –15dBm dBm e10, e15 Vo = –15dBm 33 The input range when the output level varies ±3dB e10, e15 from the standard input level (Vin = –60dBm) A C C 24 — 280 360 3 B B B fr = 100Hz Vr = –30dBm — 380 600 e10, e15 BW = 30 to 20kHz — B B B e10, e15 e10, e15 Rg = 10kΩ e10, e15 THD = 1% A B B B A 0.1 B B B B OFF OFF OFF OFF OFF OFF OFF OFF A B B B OFF ON ON ON C C C C ON REC ON REC ON REC ON REC A — 0.5 OFF OFF A –30 dBm e10, e15 Vin = –30dBm A B A OFF B A A OFF OFF A ON REC A B A OFF B Vno A OFF OFF Output noise voltage ON REC A A OFF Maximum output Vom voltage A A THD Total harmonic distortion ON REC 1.5 0 –30 dBm e10, e15 Vin = –30dBm A A A B B OFF OFF A OFF A ON REC A Channel balance CB –1.5 17.8 19.5 21.2 –30 dBm e10, e15 Vin = –30dBm A A Voltage gain A Min. Typ. Max. Unit B S9 B S8 OFF OFF S7 A S6 OFF S5 A S4 Measurement conditions ON REC S3 Measure -ment S10 S11 S12 S13 Vin1 Vin2 Vin3 Unit point Input condition A S2 SW condition Gvc (2) RADIO RECORDING: - Item CXA2500M/N V1 S5 1kHz Vin1 1µ 0.01µ 1kHz Vin2 S7 2 1 3 2.2k 33µ 330 4 S9 A B 100k 15k 1kHz Vin3 22k S11 A 10k 10k B 1µ 7 6 5 13 14 15 16 1µ 8 e8 B I11 11 S13 C A 400 to 30kHz BPF 4.7µ 10 0.0047µ 10k 400 to 30kHz BPF 9 2.2k e10 S4 12 VCC 2V Vr 2V A TUNER B METAL PB C NORMAL PB VCC PB S3 REC 10k 17 I0 A 47µ B 18 S2 19 1µ 1µ 10k 0.0047µ 20 1µ 1µ 21 22k B 22 1µ 15k A S12 S1 23 100k S10 B Vin3 10k 10k GND REF 100µ 1µ 2.2k A 1kHz e15 24 1µ 0.01µ Vin2 S8 330 400 to 30kHz BPF MIC IN (B) MIC IN (A) S6 Vin1 1kHz e17 PB PRE IN (B) 1kHz 33µ 400 to 30kHz BPF PB/MIC NF (B) PB PRE IN (A) PB OUT (B) PB/MIC NF (A) METAL SW (B) PB OUT (A) TUNER IN (B) METAL SW (A) –7– TUNER IN (A) LINE OUT (B) LINE OUT (A) REC IN (B) REC IN (A) REC OUT (B) REC OUT (A) VCC AGC TC REC/PB SW TAPE/ RADIO SW Measurement Circuit CXA2500M/N 100µ Application Circuit BIAS 1 24 –8– PB REC 0.01µ 23 3 5 20 6 19 12dB AMP AMP 22k 17 1µ 0.01µ 8 –0.3dB LINE LINE RADIO IN (A) 22k 7 18 0.01µ 1µ RADIO IN (B) 1µ 1µ REF 1µ 1µ 0.0047µ 10k 10 20.5dB REC REC 15 11 14 47µ 3.3M AGC DET TO POWER AMP (A) 9 16 10k 0.0047µ TO POWER AMP (B) 47µ 13 10k 12 22µ 22µ VCC TAPE/NORM TAPE/METAL RADIO 2.2k TAPE/ RADIO NORM/ METAL PB/ REC PB REC 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. 39k 33µ 15k 330k PB PB 330k 0.01µ 4 21 15k 330 0.01µ 39k 1000p 330 22dB GCA AGC GCA A CH 33µ 1000p 22 0.01µ MIC IN (A) 1µ 2 6dB MIC MIC 1µ MIC IN (B) CXA2500M/N CXA2500M/N Description of Operation REF Pin (Pin 1) A low impedance pin for outputting the internal reference voltage, which is fixed at 0.93V regardless of supply voltage variation. LINE OUT Pin (Pin 8) This output pin outputs signal from any selected source (MIC, Tape or Tuner) to the subsequent stages such as Dolby NR or power amplifier for further signal processing. It is internally biased at 0.58V so as to achieve maximum dynamic swing at minimum supply voltage of 1.2V. The change of DC potential at this pin that may result from any changeover of PB/REC or Tape/Tuner switch was set to be minimum, thus reducing any potential occurence of switching noise. REC Out Pin (Pin 10) This recording driver output pin is internally biased at 1.0V to achieve maximum signal swing at minimum supply voltage of 1.6V during the recording mode. The REC OUT will be momentally muted during the changeover of PB/REC or Tape/Tuner modes, so as to prevent mis-recording of any undesired switching noise. The muting period is determined by the values of R and C at Pins 12 or 13. AGC TC Pin (Pin 11) This is the external pin for AGC filter during the MIC Recording mode. The attack time is determined by the 1kΩ resistor inside the IC and the external electrolytic capacitor. The recovery time is determined by both external resistor and electrolytic capacitor at Pin 11. Notes on Operation 1. The following table shows the potential at Pins 12 and 13 and the associated operating states of the amplifier. Each of the pins, when at the same potential as Pin 14, has H level, and when at the same potential as Pin 24, has L level. System Control Operation Table Control pins Pin 13 L H Pin 12 L FLOAT H L, FLOAT H Operating mode Playback (Normal) Playback (Metal) Tuner Mode MIC Recording Tuner Recording MIC AMP OFF OFF OFF ON OFF AGC DET OFF OFF OFF ON OFF GCA OFF OFF OFF ON OFF AMP OFF OFF OFF ON OFF PB AMP ON ON OFF OFF OFF EQ SWITCH OFF ON OFF OFF OFF LINE AMP ON ON ON ON ON REC AMP OFF OFF OFF ON ON Amplifier operating state –9– CXA2500M/N 2. PB Mode: To reduce the PB amplifier DC output offset, it is recommended that 39kΩ resistor be connected as shown in the Application Circuit. However, too low this resistor value may affect the low frequency portion of the PB frequency response. The inter-relationship of the RC values in the playback equalization network is as shown below: 55 GV (dB) + PB – R1 330k R5 330 C1 0.01µ CXA2500 TAPE PB: GV, THD vs f VO = –15dBm VCC = 2V 50 R2 15k Voltage [dB] IN R3 22k 45 40 35 NORMAL 30 G1 G2 25 METAL REF C2 33µ R4 39k 10 100 1kf1 f2 10k 100k f [Hz] During Normal PB mode, Gain G1 = 20 log (R2 + R5)/R5 3dB cut-off frequency, f1 = 1/(2 × 3.1416 × C1 × R2) During Metal PB mode, Gain G2 = 20 log (R2//R3 + R5)/R5 3dB cut-off frequency, f2 = 1/(2 × 3.1416 × C1 × R2//R3) 3. Use of RC at Tape/Tuner and PB/REC pins: The purpose of the external RC components at the switch inputs is to create an internal mute pulse so as to mute the REC OUT momentally during the switching operation. By doing so, the switching click noise that may appear at REC OUT can be reduced. The selection of the RC values affects the duration of the mute pulse. It is recommended to use resistor of 2.2kΩ and below at Tape/Tuner pin, i.e Pin 12. These RC components may be removed if such internal pop noise countermeasure is not required. – 10 – CXA2500M/N Package Outline Unit: mm CXA2500M 24PIN SOP (PLASTIC) + 0.4 15.0 – 0.1 + 0.4 1.85 – 0.15 24 13 6.9 12 0.45 ± 0.1 + 0.1 0.2 – 0.05 1.27 0.5 ± 0.2 1 + 0.2 0.1 – 0.05 7.9 ± 0.4 + 0.3 5.3 – 0.1 0.15 ± 0.12 M PACKAGE STRUCTURE SONY CODE SOP-24P-L01 EIAJ CODE ∗SOP024-P-0300-A JEDEC CODE CXA2500N MOLDING COMPOUND EPOXY/PHENOL RESIN LEAD TREATMENT SOLDER PLATING LEAD MATERIAL COPPER ALLOY / 42ALLOY PACKAGE WEIGHT 0.3g 24PIN SSOP(PLASTIC) + 0.2 1.25 – 0.1 ∗7.8 ± 0.1 0.1 24 13 ∗5.6 ± 0.1 7.6 ± 0.2 A 1 12 b 0.13 M 0.5 ± 0.2 (0.15) (0.22) 0.1 ± 0.1 DETAIL B : SOLDER b=0.22 ± 0.03 + 0.03 0.15 – 0.01 + 0.1 b=0.22 – 0.05 + 0.05 0.15 – 0.02 0.65 B DETAIL B : PALLADIUM 0° to 10° NOTE: Dimension “∗” does not include mold protrusion. DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL EPOXY RESIN SONY CODE SSOP-24P-L01 LEAD TREATMENT SOLDER/PALLADIUM PLATING EIAJ CODE SSOP024-P-0056 LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.1g JEDEC CODE NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). – 11 –