CXA1998

Manufacturer Part NumberCXA1998
DescriptionRecording/Playback Equalizer Amplifier
ManufacturerSONY [Sony Corporation]
CXA1998 datasheet
 
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Recording/Playback Equalizer Amplifier
For the availability of this product, please contact the sales office.
Description
The CXA1998AQ is an IC developed for analog
signal processing in tape recorders. Processing for
both the recording and playback systems is
achieved on one chip.
Features
• 11-bit serial data interface
• Recording/playback mute function
• Recording equalizer Gp and Fp can be adjusted
externally.
• AGC (Automatic Gain Control)
• Comparator for AMS (Automatic Music Sensor)
• Recording/playback equalizer amplifier with 1.7
times speed switching
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
V
, V
CC
• Operating temperature
Topr
• Storage temperature
Tstg
• Allowable power dissipation
P
D
Operating Conditions
Supply voltage
V
CC
V
DD
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.
CXA1998AQ
Structure
Bipolar silicon monolithic IC
Applications
All analog signal processing in the cassette decks
of tape recorders and compact music centers
Applicable Head
12
V
DD
Applicable to MITSUMI ELECTRIC Co., Ltd.
–20 to +75
°C
Playback head: BP-7442-CP-6973
–65 to +150 °C
Recording/playback head: BC-9242-CB-9267
645
mW
6.5 to 10.0
V
4.5 to 5.5
V
– 1 –
48 pin QFP (Plastic)
E96802A78

CXA1998 Summary of contents

  • Page 1

    ... Recording/Playback Equalizer Amplifier For the availability of this product, please contact the sales office. Description The CXA1998AQ developed for analog signal processing in tape recorders. Processing for both the recording and playback systems is achieved on one chip. Features • 11-bit serial data interface • ...

  • Page 2

    ... GND GND D2 GND D3 GND D4 GND D5 GND D6 GND D9 D8 D11 D10 GND D9 GND D11 20k 20k GND V DD 20k 20k CXA1998AQ LATCH PL2 19 PL1 18 BPB BPA 17 16 SPEED 15 RMUTE RMUTEI 14 13 PBMUTE ...

  • Page 3

    ... Deck A equalizer switch. Low: 120µs EQ High: 70µs EQ GND V CC Deck B equalizer switch. Low: NORMAL TAPE, 120µs EQ Medium: Cro 70µs EQ High: METAL TAPE, 70µ Connects a resistor and capacitor for determining AGC 2 attack/recovery time 4 constants. 5k 200 100k GND CXA1998AQ TAPE, 2 ...

  • Page 4

    ... GND GND – 4 – CXA1998AQ Description AGC signal input Input resistance changes between 50kΩ and 100kΩ. AGC functions when the signal of –30dBm or more is input to AGC for AGC ON. (External 47µF//300kΩ ...

  • Page 5

    ... Vcc 11 147 1k — GND GND Vcc Vcc — 12 10k GND GND – 5 – CXA1998AQ Description V CC Connects a resistor for determining AMS signal detection level and a capacitor for determining HPF cut- off frequency. GND AMS block ground. GND Vcc Connects time constant for AMS detection ...

  • Page 6

    ... — 20k 20 GND 21 GND 22 — 23 – 6 – CXA1998AQ Description V DD Connects a capacitor for setting time constant for playback mute ON/OFF switching. GND Connects a capacitor for setting time constant for recording GND mute ON/OFF switching. Output for recording mute ON/OFF switch ...

  • Page 7

    ... V CC 30k 2 147 60kΩ 34 45k 30k GND GND — 35 – 7 – CXA1998AQ Description Serial data interface V latch input. DD 30k Serial data interface reset input. Low: Reset. 30k At this time serial data outputs (Pins 15 to 22) are all open (high). V ...

  • Page 8

    ... Connects a resistor for determining the high- band peak frequency of recording equalizer. Reference setting GND resistance is 27kΩ. Vcc Playback equalizer output. RFS Connects a capacitor 3 for determining playback equalizer time constants, such as 120µs and 70µs. GND CXA1998AQ ...

  • Page 9

    ... The resistance of open collector outputs (Pins 15 to 22) can be connected Vcc. I/O Equivalent circuit resistance 10k 105kΩ 147 30p 70k I 70kΩ GND GND – 9 – CXA1998AQ Description V CC RFS Playback equalizer V CC negative feedback. 1k 210k 1k 147 10p Playback equalizer 210k input. GND ...

  • Page 10

    ... CC DD Measurement conditions and V pin currents CC DD R300kΩ//C47µF R300kΩ//C47µF R300kΩ//C47µF R300kΩ//C 47µF R9.1kΩ, C0.015µF R100kΩ//C0.1µF = 2.7kΩ 2.7kΩ L – 10 – CXA1998AQ Min. Typ. Max. Unit 6.5 8.0 V 10.0 4.5 5.0 V 5.5 13.5 19.7 mA 25.0 –13.0 –11.0 dBm – ...

  • Page 11

    ... NORM – NS, at NORM – NS, at NORM – NS, at NORM – NS, at NORM – NS, at NORM – NS, at NORM – NS, at NORM – NS, at NORM – NS, at NORM – NS, – 11 – CXA1998AQ Min. Typ. Max. Unit –28.2 –26.7 –25.2 dBm — — ...

  • Page 12

    ... NS 120µs – NORMAL SPEED 120µs – HS 120µs – HIGH SPEED 70µs – NS 70µs – NORMAL SPEED 70µs – HS 70µs – HIGH SPEED Measurement conditions = 2.7kΩ 2.7kΩ L – 12 – CXA1998AQ Min. Typ. Max. Unit 8.0 8.8 — dB — ...

  • Page 13

    ... CLK) SDK t (CLK DATA) HCD (LATCH DATA) SLD t (CLK LATCH) HCL t (LATCH CLK) HLC /2. (Refer to “Equivalent circuit” of Pin Description.) DD – 13 – CXA1998AQ Min. Typ. Max. Unit 0.0 — 1.5 3.5 — 0.0 — 0.5 µA — — 1.0 kHz 500 — — — ...

  • Page 14

    ... Timing Chart for 11-bit Serial Data Interface (V CLK 3.5V DATA 1.5V t SLD LATCH 1.5V CLK DATA D10 LATCH XRESET = 5.0V) DD 3.5V 1. SDK HCD D1 3.5V t HLC t HCL D11 3.5V 1.5V 1. – 14 – CXA1998AQ ...

  • Page 15

    ... Vcc /25V µ 47 S15 RFC C15 10k R52 S11B 100 R41 S11A µ 0.018 µ 0.018 C13 C14 600 R30 – 15 – CXA1998AQ 10k S28 100k R94 OUT AMS R93 µ 0.1 C32 TC AMS 100k R92 GND AMS µ 0.015 9.1k GAIN AMS ...

  • Page 16

    ... D11 D7 RMUTEI V 20k 20k 14 DD GND V DD PBMUTE 20k 20k 4.7µ GND GND CC CC GND CXA1998AQ V DD 100k 47k V DD 47k V DD 47k V DD 47k V DD 47k V DD 47k V DD 47k V DD 47k GND 0.1µ ...

  • Page 17

    ... The standard resistor setting is 27kΩ, but when resistance value is larger, high-band peak gain is larger, and when resistance value is smaller, high-band peak gain is smaller. A-EQ (Pin 2) B-EQ (Pin 70µs According to A-EQ control (DECK A) 120µs (DECK B) , Metal CrO (TYPE II) 2 – 17 – M/H 70µs (DECK B) H METAL (TYPE IV) CXA1998AQ ...

  • Page 18

    ... Pin 18 Pin 17 — Low mute OFF — AGC function stops Pin 16 Low, normal speed — DECK A selected Pin 15 Low mute OFF – 18 – CXA1998AQ D8 D9 D10 D11 Output Input set at high Low High (OPEN) Low High (OPEN) Low High (OPEN) Low ...

  • Page 19

    ... Examples of AGC control during timer recording (1) Resets when power is turned ON (AGC function operates). (2) AGC is turned OFF after AGC inputs (Pins 5 and 32) rise. (External capacitor charge of AGC TC is discharged.) (3) AGC is turned ON and timer recording begins. 1µs or more A 1µs or more – 19 – CXA1998AQ /2. DD 5.0V ...

  • Page 20

    ... C16 4.7µ 68k 74HC165 ( – 20 – CXA1998AQ C21 GND 100µ/25V 74HC00 74HC08 (2) ...

  • Page 21

    ... CXA1998AQ ...

  • Page 22

    ... No signal detection Low High Inside IC SA HPF LPF DET 25kHz AMS GAIN 100k GND CC Fig. 1. AMS Block Diagram f C 1kHz f (Hz) Fig. 2. Frequency Response – 22 – = 8V: CC AMS OUT AMS GND 12 10 AMS TC V GND CC CC 25kHz 100kHz CXA1998AQ ...

  • Page 23

    ... To set AMS level at –25dB, determine and set the constant for Pin 9 external resistor. (Calculate assuming PBOUT1 = PBOUT2) First, get the required HPF gain from formula (2). –7.5dBm = –21dBm + (–25dB) + HPFgain, so HPF gain = 38.5dB. Next, get Pin 9 external resistance from formula (1). 38.5dB = 20log (1 + 100k / R1 ≈ 1.2kΩ, and external resistance is 1.2kΩ. (1) – 23 – CXA1998AQ (2) ...

  • Page 24

    ... 5. – Supply voltage [V] CC 500 10k 20k Frequency [Hz] – 24 – 10µF 0.018µ 120µs – NS 120µs – HS 70µs – NS 70µs – HS 50k CXA1998AQ M ...

  • Page 25

    ... Recording equalizer frequency response 0dB = NORM – NS, 315Hz, –30dBm 24 (TAPE) (SPEED) 22 NORM – NS CrO – METAL– 100 200 500 1k Frequency [Hz] – 25 – 10k 20k 50k 2k 5k 10k 20k 50k CXA1998AQ ...

  • Page 26

    ... Frequency [Hz] AGC output characteristics 300k 47µ –5 –10 –15 –35 – 0.015µ 9. 0.1µ 10k 20k 50k 1kHz AGC OFF AGC ON –25 –20 –15 –10 –5 Input level [dBm] – 26 – CXA1998AQ ...

  • Page 27

    ... Recording equalizer total harmonic distortion NORM – 2.7k L 2.0 1kHz 0dB = –10dBm 1.0 0.5 0.2 0.1 –15 –10 – Output level [dBm] Playback equalizer total harmonic distortion 120µs – 2.7k L 2.0 1kHz 1.0 0.5 0.2 0.1 –30 –25 –20 –15 –10 Output level [dBm] – 27 – 10 –5 CXA1998AQ ...

  • Page 28

    ... This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). 48PIN QFP (PLASTIC 0.15 0.3 – 0.1 ± 0.12 M 2.2 – 0.15 PACKAGE STRUCTURE PACKAGE MATERIAL LEAD TREATMENT QFP-48P-L04 LEAD MATERIAL QFP048-P-1212-B PACKAGE WEIGHT – 28 – + 0.1 0.15 – 0.05 0.15 + 0.2 0.1 – 0.1 + 0.35 EPOXY RESIN SOLDER / PALLADIUM PLATING COPPER / 42 ALLOY 0.7g CXA1998AQ ...