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
GP
GH
GL
GP CAL
GH CAL
REC CAL
NC
REC IN2
IREF
BOOST2
VCC
REC OUT2
CXA1598M
24
23
22
21
20
19
18
17
16
15
14
13
VCC
BIAS
REC EQ
PARAMETER
CONTROL
REC EQ
VGS
VEE
12
11
VEE
BOOST1
GND
REC IN1
NC
10
REC OUT1
9
8
7
REC MUTE
fM
f/Q
f×Q
6
5
4
3
DGND
2
FP CAL
1
GP
GH
GL
GP CAL
GH CAL
REC CAL
REC IN2
IREF
BOOST2
VCC
REC OUT2
CXA1598S
22
21
20
19
18
17
16
15
14
13
12
VCC
BIAS
REC EQ
PARAMETER
CONTROL
REC EQ
VGS
fM
FP CAL
DGND
7
8
9
10
11
REC OUT1
f/Q
6
VEE
5
BOOST1
4
GND
3
REC IN1
2
REC MUTE
1
f×Q
VEE
–2–
CXA1598M/S
Pin Description
Pin No.
CXA CXA
1598M 1598S
Symbol
(Ta = 25°C, VCC = 7.0V, VEE = –7.0V)
Typical pin
voltage
DC
I/O
Z (in)
Equivalent circuit
Description
AC
1
1
2
3
22
23
24
1
2
3
20
21
22
fxQ
f/Q
fM
GL
GH
GP
2
3
1.2V
—
O
—
192
22
(20)
23
(21)
27k
DGND
24
(22)
4
4
FP CAL
2.5V
—
I
54k
54k
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.
4
19
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.
5
5
DGND
0.0V
—
I
—
Connected to GND.
(17)
–3–
CXA1598M/S
Pin No.
CXA CXA
1598M 1598S
Symbol
Typical pin
voltage
DC
I/O
Z (in)
Equivalent circuit
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.
30k
6
6
REC MUTE
5.0V
Description
AC
—
I
—
6
GND
50k
8
17
7
16
REC IN1
REC IN2
0.0V –18dBv
I
Recording equalizer
amplifier input pin.
8
(7)
50kΩ
17
(16)
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)
9.5kΩ
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
4.8k 5.5k
10
(9)
15
(14)
–4–
34k
GND
280
35.5k
CXA1598M/S
Pin No.
CXA CXA
1598M 1598S
Symbol
Typical pin
voltage
DC
11
10
VEE
12
13
11
12
REC OUT1
REC OUT2
–7.0V
I/O
Z (in)
Equivalent circuit
Description
AC
—
I
Connect to the
negative power supply
for positive/negative
dual power supplies.
Connect to GND for a
single power supply.
—
200
0.0V –3.0dBv
O
—
Recording equalizer
amplifier output pin.
50k
12
(11)
200
13
(12)
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
20
18
Symbol
Typical pin
voltage
DC
GH CAL
2.5V
I/O
Z (in)
Equivalent circuit
AC
—
I
—
54k
20
(18)
21
(19)
21
19
GP CAL
2.5V
Description
—
I
—
–6–
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.
CXA1598M/S
Electrical Characteristics
Item
Min.
Typ. Max. Unit
10.0
13.6
17.4 mA
Operating voltage range 1
(positive/negative dual power
supplies)
±6.5
±7.0
±8.0
V
Operating voltage range 2
(single power supply)
10.0
14.0
16.0
V
—
–3.0
—
dBv
Entire LSI
Current consumption (ICC)
Recording equalizer amplifier
(Ta = 25°C, VCC = 7.0V, VEE = –7.0V)
Conditions
Standard settings
RGL: 36k//510k, RGH: 62k//220k,
RGP: 36k//110k, RfM: 39k//910k,
Rf/Q: 47k//750k, RfxQ: 47k//620k
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.)
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.)
Signal handling
(1kHz, THD = 1%, RL = 2.7kΩ)
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.)
Total harmonic distortion
(1kHz, 0.0dB, RL = 2.7kΩ)
11.0
11.5
—
dB
Input a 1kHz, 0.0dB (reference input level) signal and
measure the distortion. RL = 2.7kΩ
(Measure the distortion as THD + N.)
—
0.12
0.6
%
S/N ratio
("A"-WGT filter)
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.)
57.0
65.0
—
dB
Output DC offset voltage
(REC OUT pin)
With no signal, measure the DC offset voltage of the
REC OUT pin.
–500
0
500
mV
Mute characteristics 1
(REC-MUTE = 0.5V)
REC-MUTE = 0.5V (Use a 1kHz BPF.)
Input a 1kHz signal (+12dB level up) and measure the
attenuation when REC MUTE is on.
—
–100
–80
dB
Mute characteristics 2
(REC-MUTE = 2.5V)
REC-MUTE = 2.5V
Input a 1kHz, 0.0dB (reference level) signal and measure
the attenuation characteristics of the soft mute function.
–6.0
–4.5
–3.0
dB
REC-CAL characteristics 1
(REC-CAL = 5.0V)
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.
5.0
6.0
7.0
dB
REC-CAL characteristics 2
(REC-CAL = 0.0V)
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.
–7.5
–6.5
–5.5
dB
–7–
Recording equalizer amplifier
CXA1598M/S
Item
Conditions
Min.
Typ. Max. Unit
GH-CAL characteristics 1
(GH-CAL = 5.0V)
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.
4.7
5.7
6.7
dB
GH-CAL characteristics 2
(GH-CAL = 0.0V)
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.
–5.5 –4.5
–3.5
dB
GP-CAL characteristics 1
(GP-CAL = 5.0V)
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.
5.4
6.9
dB
GP-CAL characteristics 2
(GP-CAL = 0.0V)
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.
–5.8 –4.3
–2.8
dB
FP-CAL characteristics 1
(FP-CAL = 5.0V)
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.
185
200
215
%
FP-CAL characteristics 2
(FP-CAL = 0.0V)
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.
36
46
56
%
fM medium frequency
compensation frequency
variable width
0.3
2.4
10
kHz
fp peaking frequency variable
width
10
17.8
50
kHz
2
4.2
7
–5
0
8
dB
–10
–3
11
dB
10
20.5
30
dB
Peaking Q variable width
GL low frequency gain variable
width
GH medium frequency gain
variable width
GP peaking gain variable width
3.9
fM medium frequency
compensation frequency
deviation
RGL: 36k//510k, RGH • RGP: OPEN or RGH: 62k//220k,
RGL • RGP: OPEN
RfM: 39k//910k, Rf/Q: 18k, RfxQ: 12k
–15
0
15
%
fp peaking frequency deviation
RGP: 36k//110k, RGL • RGH: OPEN
RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k
–15
0
15
%
–8–
CXA1598M/S
Recording equalizer amplifier
Item
Conditions
Min.
Typ. Max. Unit
Peaking Q deviation
RGP: 36k//110k, RGL • RGH: OPEN
RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k
–20
0
20
%
GL low frequency gain deviation
RGP: 36k//510k, RGH • RGP: OPEN
RfM: 9.1k, Rf/Q: 18k, RfxQ: 12k
–0.5
0
0.5
dB
GH medium frequency gain
deviation
RGH: 62k//220k, RGL • RGP: OPEN
RfM: 300k, Rf/Q: 18k, RfxQ: 12k
–0.8
0
0.8
dB
GP peaking gain deviation
RGP: 36k//110k, RGL • RGH: OPEN
RfM: 300k, Rf/Q: 47k//750k, RfxQ: 47k//620k
–2.0
0
2.0
dB
Input impedance
Pins 8 and 17 (CXA1598M)
Pins 7 and 16 (CXA1598S)
40
50
60
kΩ
Note: Unless otherwise specified, RGL, RGH, RGP, RfM, Rf/Q, and RfxQ settings are the characteristics
when set to the standard settings.
–9–
DC
Ammeter A
Power
Supply
Power
Supply
DC
A
Ammeter
R7∗ 100k
R8∗ 36k//110k
R9∗ 6.8k
S7
S8
S9
R20∗ 300k
R21∗ 39k//910k
R22∗ 9.1k
S16
S17
R19∗ 12k
R18∗ 18k
R17∗ 33k
R16∗ 5.1k
R15∗ 47k//620k
R14∗ 47k//750k
R13∗ 39k
S15
S14
S13
S12
S11
R12∗ 160k
R11∗ 160k
R10∗ 39k
R6∗ 6.8k
S6
S10
R5∗ 62k//220k
S5
Audio
SG
R23∗
620
C1
0.1µ
S18
1
2
R27
50k
3
R28
1k
4
C5
1µ
25V
5
R33
1k
6
S23
C8
1µ
25V
CXA1598S
7
C10
2.2µ
50V
S25
C12
100µ
25V
R35∗
5.1k
8
S27
C13∗
0.47µ
9
S28
10
C15
100µ
11
C17
4.7µ
50V
12
13
14
15
16
17
C18
4.7µ
50V
18
S20
C11
2.2µ
50V
19
S24
R37∗
27k
20
S22
R36∗
5.1k
21
R24∗
36k//
300k
S21
C9
1µ
25V
C16
100µ
22
C3
10µ
50V
S19
C7
1µ
25V
S29
GP
C2 C4
0.1µ 10µ
50V
C6
1µ
25V
C14∗
0.47µ
GH
f×Q
R4∗ 110k
R25∗
36k//
300k
S26
GL
f/Q
R3∗ 10k
R34
1k
GP CAL
fM
S4
R31
1k
GH CAL
REC MUTE
S3
R29
1k
REC CAL
REC IN1
S2
REC IN2
GND
R1∗ 62k
IREF
BOOST1
R2∗ 36k//510k
R32
50k
BOOST2
VEE
S1
R30
50k
VCC
FP CAL
– 10 –
DGND
GND
R26
50k
REC OUT1 REC OUT2
DC 5V
Supply
Electrical Characteristics Measurement Circuit (CXA1598S)
R40 S32
10k
S30
R38∗
2.7k
R41
100 S33
IN
Coupling Capacitor
2. Capacitor tolerance
S39
S40
S41
±5%
∗: ±1%
±5%
∗: ±2%
±10%
Oscilloscope
Distortion
Analyzer
AC
Voltmeter
Note. 1. Resistor tolerance
OUT
S38
Filter
1ch
Noise Filter
1kHz BPF
DIN Audio
R42 S34
100
DC
Voltmeter
"A" WTG
2ch S37
1ch
2ch S36
R39∗
2.7k
S31
R43
10k S35
CXA1598M/S
– 11 –
DC
Ammeter A
Power
Supply
Power
Supply
R20∗ 300k
R21∗ 39k//910k
R22∗ 9.1k
S16
S17
R19∗ 12k
R18∗ 18k
R17∗ 33k
R16∗ 5.1k
R15∗ 47k//620k
R14∗ 47k//750k
R13∗ 39k
R12∗ 160k
R11∗ 160k
S15
S14
S13
S12
S11
S10
R9∗ 6.8k
S9
R10∗ 39k
R8∗ 36k//110k
R7∗ 100k
S7
S8
R6∗ 6.8k
S6
Audio
SG
R23∗
620
C1
0.1µ
S18
2
1
S20
R28
1k
R27
50k
3
4
C5
1µ
25V
5
R33
1k
S23
C8
1µ
25V
7
6
CXA1598M
8
C10
2.2µ
50V
S25
R35∗
5.1k
C12
100µ
25V
9
S27
C13∗
0.47µ
S28
11
10
C15
100µ
12
C17
4.7µ
50V
13
14
15
16
17
18
19
20
21
S24
22
S22
C18
4.7µ
50V
23
R24∗
36k//
300k
S21
C11
2.2µ
50V
R37∗
27k
24
C3
10µ
50V
S19
f×Q
R5∗ 62k//220k
f/Q
S5
R25∗
36k//
300k
R36∗
5.1k
C16
100µ
GP
S29
GH
C2 C4
0.1µ 10µ
50V
C9
1µ
25V
C14∗
0.47µ
GL
fM
R4∗ 110k
C7
1µ
25V
S26
GP CAL
FP CAL
S4
C6
1µ
25V
R34
1k
GH CAL
DGND
R3∗ 10k
R31
1k
REC MUTE REC CAL
S3
R29
1k
NC
NC
R2∗ 36k//510k
REC IN2
REC IN1
S2
IREF
GND
R1∗ 62k
R32
50k
BOOST2
BOOST1
S1
R30
50k
VCC
VEE
DC
Ammeter A
GND
R26
50k
REC OUT1 REC OUT2
DC 5V
Supply
Electrical Characteristics Measurement Circuit (CXA1598M)
R40 S32
10k
S30
R38∗
2.7k
R41
100 S33
IN
Coupling Capacitor
2. Capacitor tolerance
±5%
∗: ±1%
±5%
∗: ±2%
±10%
Oscilloscope
Distortion
Analyzer
AC
Voltmeter
Note. 1. Resistor tolerance
OUT
S38
Filter
1ch
Noise Filter
S39
S40
DIN Audio
1kHz BPF
S41
R42 S34
100
DC
Voltmeter
"A" WTG
2ch S37
1ch
2ch S36
R39∗
2.7k
S31
R43
10k S35
CXA1598M/S
R9
R8
R7
R3
R2
R1
NORMAL
SPEED
HIGH
SPEED
R10
TYPEI R4
NORMAL
TYPEIV
METAL
TYPEII
CrO2
R11
R5
R13
R14
R15
R19
R20
R21
R22
R25
R26
R27
R28
R31
R32
R33
R34
GND
1
3
4
CXA1598S
5
6
R37
10k
C1
3.3µ
50V
R41
5.6k
C3
0.47µ
R39
10k
GND
GND
VEE
10
9
8
7
GND
C5
100µ
25V
11
L1
27mH
GND
C7
C9
3.3µ 150p
50V
R45
12k
C11
75p
C12
75p
L2
27mH
BIAS
OSC
R46
12k
C8
3.3µ C10
50V 150p
GND
REC OUT1
(to HEAD)
REC OUT2
(to HEAD)
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.
2
f×Q
R16
12
GND
13
14
15
16
17
18
19
20
C4
0.47µ
21
R44
27k
22
f/Q
R35
fM
R29
FP CAL
R23
DGND
R17
C2
3.3µ
50V
GP
REC IN1
GP
R36
GH
GND
GH
R30
GL
BOOST1
GL
R24
GP CAL
VEE
f×Q
R18
C5
100µ
25V
GH CAL
FP CAL
(DC CONTROL)
f/Q
R12
VCC
REC MUTE REC CAL
GND
REC IN2
R40 R42
10k 5.6k
IREF
GP CAL
(DC CONTROL)
BOOST2
GH CAL
(DC CONTROL)
VCC
REC MUTE
(SOFT MUTE/FADER)
– 12 –
LINE IN1
fM
R6
REC CAL
(DC CONTROL)
R38
10k
LINE IN2
REC OUT1 REC OUT2
Application Circuit for Positive/Negative Dual Power Supplies (CXA1598S)
CXA1598M/S
R10
R9
R8
R7
TYPEI R4
NORMAL
R3
R2
R1
NORMAL
SPEED
HIGH
SPEED
R11
R5
TYPEIV
METAL
R13
R14
R15
R19
R20
R21
R22
R25
R26
R27
R28
R31
R32
R33
R34
GND
1
3
6
5
4
R37
10k
7
C1
3.3µ
50V
CXA1598M
R41
5.6k
R39
10k
GND
GND
VEE
C3
0.47µ
11
10
9
8
GND
C5
100µ
25V
GND
13
C5
100µ
25V
12
L1
27mH
GND
C7
C9
3.3µ 150p
50V
R45
12k
C11
75p
C12
75p
L2
27mH
BIAS
OSC
R46
12k
C8
3.3µ C10
50V 150p
GND
REC OUT1
(to HEAD)
REC OUT2
(to HEAD)
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.
2
f×Q
R16
14
15
16
17
18
19
20
21
22
C4
0.47µ
23
R44
27k
24
fM
R35
FP CAL
R29
DGND
R23
NC
R17
C2
3.3µ
50V
GP
REC IN1
GP
R36
GH
GND
GH
R30
GL
BOOST1
GL
R24
GP CAL
VEE
f×Q
R18
VCC
GH CAL
f/Q
TYPEII
CrO2
f/Q
R12
GND
REC MUTE REC CAL
FP CAL
(DC CONTROL)
fM
R6
R40 R42
10k 5.6k
NC
GP CAL
(DC CONTROL)
REC IN2
GH CAL
(DC CONTROL)
IREF
REC CAL
(DC CONTROL)
BOOST2
R38
10k
LINE IN2
VCC
REC MUTE
(SOFT MUTE/FADER)
– 13 –
LINE IN1
REC OUT1REC OUT2
Application Circuit for Positive/Negative Dual Power Supplies (CXA1598M)
CXA1598M/S
NORMAL
SPEED
HIGH
SPEED
TYPEIV
METAL
R8
R7
R2
R1
R9
R3
TYPEII
CrO2
R10
TYPEI R4
NORMAL
R13
R14
R15
R16
R17
R19
R20
R21
R22
R23
R25
R26
R27
R28
R29
R31
R32
R33
R34
R35
GND
3
4
5
6
R37
10k
C1
3.3µ
50V
R41
5.6k
R39
10k
GND
GND
GND
10
9
8
7
GND
12
C5
100µ
25V
11
L1
27mH
GND
C7
C9
3.3µ 150p
50V
R45
12k
C11
75p
C12
75p
L2
27mH
BIAS
OSC
R46
12k
C8
3.3µ C10
50V 150p
GND
REC OUT1
(to HEAD)
REC OUT2
(to HEAD)
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.
2
1
CXA1598S
13
14
15
16
17
18
19
20
C3
0.47µ
C4
0.47µ
21
C1
10µ
25V
R44
27k
22
f×Q
R11
f/Q
R5
C2
3.3µ
50V
GP
fM
GP
R36
GH
DGND
GH
R30
GL
REC IN1
GL
R24
GP CAL
FP CAL
FP CAL
(DC CONTROL)
GND
f×Q
R18
VCC
GH CAL
GND
REC MUTE REC CAL
BOOST1
f/Q
R12
R40 R42
10k 5.6k
REC IN2
GP CAL
(DC CONTROL)
IREF
GH CAL
(DC CONTROL)
BOOST2
VEE
fM
R6
REC CAL
(DC CONTROL)
R38
10k
LINE IN2
VCC
REC MUTE
(SOFT MUTE/FADER)
– 14 –
LINE IN1
REC OUT1 REC OUT2
Application Circuit for a Single Power Supply (CXA1598S)
CXA1598M/S
NORMAL
SPEED
HIGH
SPEED
TYPEIV
METAL
R8
R7
R2
R1
R9
R3
TYPEII
CrO2
R10
TYPEI R4
NORMAL
R13
R14
R15
R16
R19
R20
R21
R22
R23
R25
R26
R27
R28
R29
R31
R32
R33
R34
R35
GND
3
4
6
5
R37
10k
7
C1
3.3µ
50V
R41
5.6k
R39
10k
GND
GND
GND
C3
0.47µ
11
10
9
8
GND
13
C5
100µ
25V
12
L1
27mH
GND
C7
C9
3.3µ 150p
50V
R45
12k
C11
75p
C12
75p
L2
27mH
BIAS
OSC
R46
12k
C8
3.3µ C10
50V 150p
GND
REC OUT1
(to HEAD)
REC OUT2
(to HEAD)
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.
2
1
CXA1598M
14
15
16
17
18
19
20
21
22
C4
0.47µ
23
C1
10µ
25V
R44
27k
24
fM
R17
f×Q
R11
f/Q
R5
C2
3.3µ
50V
GP
DGND
GP
R36
GH
NC
GH
R30
GL
REC IN1
GL
R24
GP CAL
FP CAL
FP CAL
(DC CONTROL)
GND
f×Q
R18
GH CAL
BOOST1
f/Q
R12
VCC
REC MUTE REC CAL
VEE
fM
R6
R40 R42
10k 5.6k
GND
NC
GP CAL
(DC CONTROL)
REC IN2
GH CAL
(DC CONTROL)
IREF
REC CAL
(DC CONTROL)
BOOST2
R38
10k
LINE IN2
VCC
REC MUTE
(SOFT MUTE/FADER)
– 15 –
LINE IN1
REC OUT1REC OUT2
Application Circuit for a Single Power Supply (CXA1598M)
CXA1598M/S
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
C2
0.47µ
From LINE IN
BOOST
R2
8.2k
R1
10k
0dBv
R10
50k
C1
2.2µ
GND
C3
200p
–7dBv
OP1
R12
35k
Gm1
R13
5.5k
BIAS
OSC
GND
R15
4.8k
REC IN
–18dBv
×1
R20
–7dBv 40k
Gm4
–3dBv
VGS
R14
34k
GND
R9 27k
DGND
VGS
BIAS
–6dBv
IREF
R8 RGL
GL
R16
20k
R7 RGH
GH
R6 RGP
GP
R19
24k
DVCC
×1
C5
100p
REC CAL
+6dBv
GND
DGND
fM
R4 Rf/Q
f/Q
R3 Rf × Q
f×Q
GND
Gm2
OP2
R17
20k
R5 RfM
C7
150p
GND
R18
8k
DGND
DGND
REC HEAD
VGS
VEE
GND
C6 R23
3.3µ 12k
R21
50k
VCC
VEE
27mH
REC OUT
OP3
R11
5k
VCC
C8
75p
GND
–6dBv
GH CAL
CALIBRATION
GP CAL
FP CAL
Gm3
×1
PARAMETER
C4
100p
R22
50k
R24
50k
R25
50k
R26
50k
VGS
DGND
GND
CONTROL
REC MUTE
to Control IC
Fig. 1. CXA1598M/S functional circuit block diagram
Gain [dB]
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.
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
GP CAL
Gain [dB]
REC CAL
GP CAL
REC CAL
GH CAL
REC CAL
REC 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.
Pin Name
4
(4)
FP CAL
6
(6)
REC MUTE
17
(19)
REC CAL
18
(20)
GH CAL
19
(21)
GP CAL
Pin voltage [V], referenced to DGND
0.0
0.5
2.5
4.5
5.0
Reduce < < < < < < < < Increase
46
—
—
—
200
Reduce < < < < < < < < Increase
—
–100
–4.5
—
—
Reduce < < < < < < < < Increase
–6.5
—
—
—
6.0
Reduce < < < < < < < < Increase
–4.5
—
—
—
5.7
Reduce < < < < < < < < Increase
–4.2
—
—
—
– 18 –
5.4
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
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
VEE
R17
R23
R29
R35
R4
R10
R16
R22
R28
R34
R3
R9
R15
R21
R27
R33
R2
R8
R14
R20
R26
R32
R1
R7
R13
R19
R25
R31
22
21
15
20
CXA1598S
7 VEE
B 10
VSS
C 9
SPEED
HIGH/NORM
GND
TYPEIV/I, II
DGND
3 12
A 11
fM
0 13
INH
8
R11
f/Q
5 5
6
R5
R44
27k
f×Q
4 7
GP
R36
1 14
COM
4051B
3
GH
R30
IREF
2 15
GL
R24
GL
2 6
f×Q
R18
GH
VDD 16
f/Q
R12
GP
1 4
fM
R6
1
2
3
5
70µs/120µs
Fig. 5. For positive/negative dual power supplies
VDD
GND
R23
R29
R35
R4
R10
R16
R22
R28
R34
R3
R9
R15
R21
R27
R33
R2
R8
R14
R20
R26
R32
R1
R7
R13
R19
R25
R31
22
21
20
15
CXA1598S
B 10
VSS
C 9
SPEED
HIGH/NORM
TYPEIV/I, II
DGND
7 VEE
fM
3 12
A 11
8
R17
0 13
INH
6
R11
f/Q
5 5
R5
R44
27k
f×Q
4 7
GP
R36
1 14
COM
4051B
3
GH
R30
IREF
2 15
GL
R24
GL
2 6
f×Q
R18
GH
VDD 16
f/Q
R12
GP
1 4
fM
R6
1
2
3
5
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 –
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)
Positive/negative
Positive power supply Negative power supply
dual power supplies
Single power supply
Power supply
GND
GND
GND
—∗
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
RGH gain characteristics
20
20
VCC, VEE = ±7V
RGH OPEN
RGP OPEN
RfM 9.1k
Rf/Q 18k
Rf × Q 12k
0dB = 315Hz,
–23dBv (–20dB)
f = 1kHz
10
GL [dB]
5
0
10
5
–5
0
–5
–10
–10
–15
–15
–20
–20
–25
1k
10k
100k
VCC, VEE = ±7V
RGH OPEN
RGP OPEN
RfM 300k
Rf/Q 18k
Rf × Q 12k
0dB = 315Hz,
–23dBv (–20dB)
f = 1kHz
15
GH [dB]
15
–25
1k
1M
10k
RGL [Ω]
RGP gain characteristics
20
VCC, VEE = ±7V
RGL 36k//510k
RGH OPEN
RGP OPEN
Rf/Q 18k
Rf × Q 12k
10k
fM [Hz]
25
GP [dB]
100k
VCC, VEE = ±7V
RGL OPEN
RfM 300k
Rf/Q 47k//750k
Rf × Q 47k//620k
0dB = 315Hz,
–23dBv (–20dB)
RGH OPEN
RGH 31.5k
30
1M
RfM cut-off frequency characteristics
40
35
100k
RGH [Ω]
15
10
1k
5
0
–5
1k
10k
100k
1M
100
1k
RGP [Ω]
10k
100k
1M
RfM [Ω]
Rf/Q cut-off frequency characteristics
RfxQ cut-off frequency characteristics
100k
1M
VCC, VEE = ±7V
RGL OPEN
RGH OPEN
RGP 36k//110k
RfM 300k
Rf × Q 37.4k
100k
f/Q [Hz]
f × Q [Hz]
10k
VCC, VEE = ±7V
RGL OPEN
RGH OPEN
RGP 36k//110k
RfM 300k
Rf/Q 38.6k
1k
100
1k
10k
10k
100k
1k
1k
1M
10k
100k
Rf × Q [Ω]
Rf/Q [Ω]
– 21 –
1M
CXA1598M/S
Output level vs. Mute characteristics 1
Current consumption vs. Supply voltage
14
ICC
IEE
ICC/IEE [mA]
100
Output level [%]
80
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
12
60
11
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
40
20
3
4
5
6
7
8
9
10
11
Supply voltage [V]
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
Output level vs. Mute characteristics 3
0
0
–20
Output level [dB]
Output level [dB]
–20
–40
–60
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
–80
–100
–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
–60
–80
0.5
1.0
REC MUTE pin voltage [V]
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
REC MUTE pin voltage [V]
– 22 –
5.0
10.0
CXA1598M/S
Total harmonic distortion
Load characteristics
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
Maximum output level [dB]
15
315Hz
1kHz
3kHz
6.3kHz
10kHz
15kHz
1.0
VCC, VEE = ±7V
RGL 36k//510k
RGH 62k//220k
RGP 36k//110k
RfM 39k//910k
Rf/Q 47k//750k
Rf × Q 47k//620k
0dB = –3dBv
THD + N = 1%
315Hz
1kHz
10
5
0
1k
100
10k
RL – load resistance [Ω]
0.1
–10
0
10
20
Output level [dB]
Output level vs. REC CAL voltage
8
6
4
Output level [dB]
T. H. D + N [%]
10
2
0
–2
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
–4
–6
–8
–2.0 –1.0
0.0
1.0
2.0
3.0
4.0
REC CAL pin voltage [V]
– 23 –
5.0
6.0
7.0
CXA1598M/S
Output level vs. GH CAL voltage
6
4
Output level [dB]
2
3kHz
8kHz
12kHz
Setting 1
3kHz
Setting 2
0
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
–4
–6
–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
Output level [dB]
2
3kHz
8kHz
12kHz
Setting 1
12kHz
Setting 2
0
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
–4
–6
–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 variation ratio [%]
fp peaking frequency vs. FP CAL pin voltage
220
180
140
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
100
60
20
–2.0
–1.0
0.0
1.0
2.0
3.0
4.0
FP CAL pin voltage [V]
– 24 –
5.0
6.0
7.0
CXA1598M/S
REC CAL and GH CAL frequency response
Output response [dB]
VCC, VEE = ±7V
30 0dB = 315Hz, –23dBv (–20dB), REC CAL,
GH CAL, GP CAL, FP CAL = 2.5V
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
10
f1
f4
f7 f2
0
f3
f6
f9
–10
10
f5
f8
100
1k
100k
10k
Frequency [Hz]
REC CAL and GP CAL frequency response
Output response [dB]
VCC, VEE = ±7V
30 0dB = 315Hz, –23dBv (–20dB), REC CAL,
GH CAL, GP CAL, FP CAL = 2.5V
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
10
f2
0
f3
f7
f5
f8
f6
f9
–10
10
f4
f1
100
1k
10k
100k
Frequency [Hz]
REC CAL and FP CAL frequency response
Output response [dB]
VCC, VEE = ±7V
30 0dB = 315Hz, –23dBv (–20dB), REC CAL,
GH CAL, GP CAL, FP CAL = 2.5V
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
f7
f4
f8
f5
f9
f6
f1
f2
f3
10
0
–10
10
100
1k
Frequency [Hz]
– 25 –
10k
100k
CXA1598M/S
Package Outline
Unit: mm
CXA1598M
24PIN SOP (PLASTIC)
+ 0.4
15.0 – 0.1
+ 0.4
1.85 – 0.15
24
13
6.9
12
0.45 ± 0.1
0.5 ± 0.2
1
7.9 ± 0.4
+ 0.3
5.3 – 0.1
0.15
+ 0.2
0.1 – 0.05
+ 0.1
0.2 – 0.05
1.27
± 0.12 M
PACKAGE STRUCTURE
SONY CODE
SOP-24P-L01
EIAJ CODE
∗SOP024-P-0300-A
JEDEC CODE
MOLDING COMPOUND
EPOXY/PHENOL RESIN
LEAD TREATMENT
SOLDER PLATING
LEAD MATERIAL
COPPER ALLOY / 42ALLOY
PACKAGE WEIGHT
0.3g
CXA1598S
+ 0.1
0.05
0.25 –
22PIN SDIP (PLASTIC)
+ 0.4
19.2 – 0.1
7.62
+ 0.3
6.4 – 0.1
12
22
0° to 15°
11
1
0.5 ± 0.1
+ 0.15
0.9 – 0.1
+ 0.4
3.9 – 0.1
+ 0.15
3.25 – 0.2
0.51 MIN
1.778
PACKAGE STRUCTURE
MOLDING COMPOUND
EPOXY RESIN
SONY CODE
SDIP-22P-01
LEAD TREATMENT
SOLDER PLATING
EIAJ CODE
SDIP022-P-0300
LEAD MATERIAL
COPPER ALLOY
PACKAGE WEIGHT
0.95g
JEDEC CODE
– 26 –