View CXA2500_143494.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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. 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 Applications 3V headphone radio cassette recorders Structure Bipolar silicon monolithic IC Bock Diagram
PB OUTPUT (A) MIC INPUT (B) PB EQ SWITCH (B)
CXA2500M 24 pin SOP (Plastic)
CXA2500N 24 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta = 25C) * Supply voltage VCC 7 * Operating temperature Topr -20 to +75 * Storage temperature Tstg -65 to +150 * Allowable power dissipation PD CXA2500M CXA2500N Operating Conditions Supply voltage PB REC 600 470
V C C mW mW
VCC VCC
1.2 to 3.5 1.6 to 3.5
V V
LINE OUTPUT (B)
REC DRIVE INPUT (B)
REC DRIVE OUTPUT (B)
PB PRE INPUT (B)
24
23
22
21
20
19
18
17
16
15
14
PB MIC GCA AMP AGC REF
AGC DET
LINE
REC
PB/ REC
NORM/ METAL
AMP MIC 6dB 1 2 GCA 22dB 3 4 PB 12dB LINE -0.3dB REC 20.5dB 9 10 11 12 TAPE/ TUNER
5
6
7
8
PB EQ SWITCH (A)
LINE OUTPUT (A)
REC DRIVE OUTPUT (A)
AGC TIME CONSTANT
MIC INPUT (A)
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.
PB OUTPUT (A)
-1-
TAPE/TUNER SELECTOR
REFERENCE
REC DRIVE INPUT (A)
PB PRE INPUT (A)
PB NF (A)
TUNER INPUT (A)
PB/REC SELECTOR
13
TUNER INPUT (B)
PB NF (B)
GROUND
VCC
E94806B8Y
CXA2500M/N
Pin Description No. Symbol Voltage (Typ.) Equivalent circuit
VCC
Pin voltage is during VCC = 2V Description
2 23
MIC IN (A) MIC IN (B)
0.93V
510 2 23 10k 20k Vref VCC 20k
MIC preamplifier input
3 22
PB PRE IN (A) PB PRE IN (B)
510
0.93V
22 3
Vref
PB preamplifier input
VCC
4 21
PB-NF (A) PB-NF (B)
0.93V
510 Vref
510 21 4
PB equalizer circuit negative feedback
VCC
5 20
PB OUT (A) PB OUT (B)
0.93V
20 5
PB preamplifier output
VCC
6 19
PB EQ SW (A) PB EQ SW (B)
0.93V
19 6
PB equalizer switch
-2-
CXA2500M/N
No.
Symbol
Voltage (Typ.)
Equivalent circuit
VCC
Description
40k
7 18
TUNER IN (A) TUNER IN (B)
0.93V
40k 18 7 4k Vref
Tuner input
VCC
8 17
LINE OUT (A) LINE OUT (B)
40k
142 17 8
0.58V
Line amplifier output
VCC
9 16
REC AMP IN (A) REC AMP IN (B)
0.93V
16 9 10k 4k
REC drive input
Vref VCC
10 15
REC AMP OUT (A) REC AMP OUT (B)
15
1.0V
10
REC drive output
VCC
1
REF
0.93V
1
Reference voltage output
-3-
CXA2500M/N
No.
Symbol
Voltage (Typ.)
Equivalent circuit
Description
VCC
11
AGC TC
0.37V
11
1k
AGC time constant
VCC 150k 142
12
TAPE/TUNER
0.5V (Open)
50k
12
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
PB/REC selection During PB = 0V During REC = 2.0V
-4-
Electrical Characteristics
SW condition S4 C 1.8 C A A C OFF A OFF OFF B B B B A V1 OFF A OFF OFF B B B B A Io OFF A OFF OFF B B B B A Io Vcc = 2.0V No signal, Tuner OFF A OFF OFF B B B B A Io Vcc = 2.0V 3.8 No signal, Mic Rec 1.3 OFF A OFF OFF B B B B A Io Vcc = 2.0V No signal, Tape 3.2 5.2 2.8 4.2 S5 S6 S7 S8 S9 Measurement conditions 5.5 7.2 mA 4.7 6.2 0.78 0.93 1.05 V Input condition Min. Typ. Max. Unit
VCC = 2.0V, f = 1kHz, Ta = 25C, unless otherwise specified.
Item
Symbol
S1
S2
S3
Measure -ment S10 S11 S12 S13 Vin1 Vin2 Vin3 Unit point
Tape playback quiescent current
Icq1
A
OFF PB
MIC recording quiescent current
Icq2
A
OFF REC
Radio playback quiescent current
Icq3
A
OFF PB
Radio pecording quiescent current
Icq4
A
OFF REC
Vcc = 2.0V 2.8 No signal, Tuner Rec Vcc = 2.0V No signal, Tape
Reference voltage
Vref
A
ON
PB
(1) PLAYBACK MODE C C B C C C C C OFF A OFF OFF OFF A OFF OFF B B OFF A ON ON B B B B B B B OFF A ON ON B B B B B B B OFF A ON ON B B B B A A A A A OFF A ON ON B B B B A OFF A ON ON B B B B A OFF A ON ON A A B B A dBm e8, e17 Vo = -15dBm dBm e8, e17 Vo = -15dBm dBm e8, e17 Vo = -15dBm dBm e8, e17 Vo = -15dBm dBm e8, e17 Vo = -15dBm e8, e17 THD = 1% e8, e17 Rg = 2.2k e8, e17 fr = 100Hz Vr = -30dBm 54 65 -- 28.5 30.8 33.0 dB 25.5 27.2 29.0 -2.0 -- 0 +2.0 0.3 1.05 190 300 -- 72 27.5 35 -- 125 -- % mV V
CXA2500M/N
Open loop voltage gain
-5-
Gvo
A
ON
PB
Close loop voltage gain 1
Gvc1
A
ON
PB
Close loop voltage gain 2
Gvc2
A
ON
PB
Channel balance
CB
A
ON
PB
Total harmonic distortion
THD
A
ON
PB
Maximum output voltage
Vom
A
ON
PB
Output noise voltage
Vno
A
ON
PB
Ripple rejection RR
B
ON
PB
dB
SW condition S4 S5 S6 S7 S8 S9 Measurement conditions Min. Typ. Max. Unit
Input condition
Item
Symbol
S1
S2
S3
Measure -ment S10 S11 S12 S13 Vin1 Vin2 Vin3 Unit point
(2) RADIO RECORDING: A A A A A A OFF A OFF OFF B B B B A e10, e15 OFF A OFF OFF B B B B A OFF A OFF OFF B B A A A e10, e15 THD = 1% e10, e15 Rg = 10k fr = 100Hz Vr = -30dBm OFF A OFF OFF B B A A A -30 dBm e10, e15 Vin = -30dBm -- OFF A -1.5 OFF OFF B B A A A -30 dBm e10, e15 Vin = -30dBm 0 0.1 380 600 -- 24 OFF A OFF OFF B B A A A -30 dBm e10, e15 Vin = -30dBm 17.8 19.5 21.2 1.5 0.5 -- 280 360 33 -- dB % mV V dB
Voltage gain
Gvc
A
ON REC
Channel balance CB
A
ON REC
Total harmonic distortion
THD
A
ON REC
Maximum output Vom voltage
A
ON REC
Output noise voltage
Vno
A
ON REC
Ripple rejection RR
B
ON REC
(3) MIC RECORDING: C C C C OFF A OFF OFF B B B B A ON B OFF OFF B B B B A -50 ON B OFF OFF B B B B C ON B OFF OFF B B B B C dBm e10, e15 Vo = -15dBm dBm e10, e15 Vo = -15dBm dBm e10, e15 Vin = -50dBm 58.5 61.8 65.0 dB -1.5 -- e10, e15 BW = 30 to 20kHz -- 0 1.5 3 1.5 4.5 4.7 % mV
Voltage gain
Gvc
A
ON REC
-6-
C ON B OFF OFF B B B B A C C C OFF A ON B ON B OFF OFF OFF OFF OFF OFF B B B B B B B B B B B B A A A -60 -60
Channel balance
CB
A
ON REC
Total harmonic THD distortion
A
ON REC
Output noise voltage
Vno
A
ON REC
ALC width
W ALC
A
ON REC
The input range when the output level varies 3dB e10, e15 from the standard input level (Vin = -60dBm) dBm e10, e15 Vin = -60dBm dBm e10, e15 Vin = -60dBm e10, e15 fr = 100Hz Vr = -30dBm
--
39
--
dB
ALC voltage
Vo ALC
A
ON REC
230 340 470 mV -2 -5 0 3 +2 dB --
ALC balance
CB ALC
A
ON REC
CXA2500M/N
Ripple rejection RR
B
ON REC
Measurement Circuit
e17 400 to 30kHz BPF A Vr 2V VCC 1 S3 REC 10k 20 19 18 17 16 15 14 13 PB 2V e15
33 1kHz 330 A B 1 S2 I0 10k 1 0.0047 47 B S10 B 15k 22k A S12 Vin2 S8 2.2k 1 Vin3 S1 1kHz 10k 10k
400 to 30kHz BPF
1kHz
Vin1
0.01
S6
1
100k 23 22 21
24
GND
MIC IN (B)
PB PRE IN (B)
PB/MIC NF (B)
METAL SW (B)
PB OUT (B)
TUNER IN (B)
LINE OUT (B)
REC IN (B)
VCC
REF
MIC IN (A)
PB/MIC NF (A)
AGC TC
PB PRE IN (A)
PB OUT (A)
METAL SW (A)
1 2 3 7 4
5
6
TUNER IN (A)
LINE OUT (A)
REC IN (A)
8 1 1
9
REC OUT (A)
10
11 S13 C A B
TAPE/ RADIO SW
12 VCC 2.2k 10k 4.7 S4 I11
-7-
100k 1 S7 Vin2 S9 A Vin3 330 1kHz 10k 10k 1kHz 2.2k B 15k 22k S11 A B 1 33
100
V1
1
S5
REC OUT (B)
REC/PB SW
A TUNER B METAL PB C NORMAL PB 0.0047
0.01
Vin1
1kHz
400 to 30kHz BPF e8
400 to 30kHz BPF e10
CXA2500M/N
Application Circuit
39k 33 1000p PB 10k 15k 22k 47 15 14 13 0.01 22 17 21 20 16 330k 19 18 1 10k 22 330 0.01 1 1 0.0047 VCC RADIO IN (B) REC TO POWER AMP (B)
MIC IN (B)
0.01
1
24
23
PB GCA LINE AMP AGC REF
AGC DET
MIC
REC
PB/ REC
NORM/ METAL
BIAS
-8-
AMP GCA 12dB PB -0.3dB 22dB 3 7 0.01 1 330k 0.01 A CH 15k 22k 4 5 6 LINE 2 8 9 1000p 330 0.01 1 33 39k RADIO IN (A) 1
MIC
REC 20.5dB 10 11
TAPE/ RADIO
6dB
1
12 RADIO TAPE/METAL 2.2k 10k 3.3M 0.0047 47 22 TAPE/NORM
100
1
REC
PB
MIC IN (A)
TO POWER AMP (A)
CXA2500M/N
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.
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 1k 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 Amplifier operating state MIC AMP AGC DET GCA AMP PB AMP EQ SWITCH LINE AMP REC AMP Pin 13 Pin 12 Operating mode L Playback (Normal) OFF OFF OFF OFF ON OFF ON OFF -9- L FLOAT Playback (Metal) OFF OFF OFF OFF ON ON ON OFF H Tuner Mode OFF OFF OFF OFF OFF OFF ON OFF L, FLOAT MIC Recording ON ON ON ON OFF OFF ON ON H H Tuner Recording OFF OFF OFF OFF OFF OFF ON ON
CXA2500M/N
2. PB Mode: To reduce the PB amplifier DC output offset, it is recommended that 39k 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) 50 45 40 35 30 25 METAL NORMAL G1 G2 CXA2500 TAPE PB: GV, THD vs f VO = -15dBm VCC = 2V
IN
+ PB - R1 330k
R5 330 REF C2 33
C1 0.01 R4 39k
R2 15k
R3 22k
Voltage [dB]
10
100
1kf1 f2 f [Hz]
10k
100k
During Normal PB mode, Gain G1 = 20 log (R2 + R5)/R5 3dB cut-off frequency, f1 = 1/(2 x 3.1416 x C1 x R2) During Metal PB mode, Gain G2 = 20 log (R2//R3 + R5)/R5 3dB cut-off frequency, f2 = 1/(2 x 3.1416 x C1 x 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 2.2k 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 CXA2500M
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
CXA2500N
7.8 0.1
24PIN SSOP(PLASTIC)
+ 0.2 1.25 - 0.1 0.1 13
24
A
1 b
12
0.13 M B 0.65
5.6 0.1
+ 0.05 0.15 - 0.02
0.5 0.2
DETAIL B : SOLDER 0 to 10
(0.15)
0.1 0.1
(0.22)
b=0.22 0.03
DETAIL B : PALLADIUM
NOTE: Dimension "" does not include mold protrusion. DETAIL A
PACKAGE STRUCTURE
PACKAGE MATERIAL EPOXY RESIN SOLDER/PALLADIUM PLATING 42/COPPER ALLOY 0.1g LEAD TREATMENT LEAD MATERIAL PACKAGE MASS
SONY CODE EIAJ CODE JEDEC CODE
SSOP-24P-L01 SSOP024-P-0056
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). - 11 -
+ 0.03 0.15 - 0.01
+ 0.1 b=0.22 - 0.05
7.6 0.2
0.5 0.2
1
12
6.9

▲Up To Search▲

Price & Availability of CXA2500

	To Download CXA2500 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .