SONY CXA1797

CXA1797Q
Dolby B-C Type Noise Reduction System with Recording Equalizer Amplifier
Description
The CXA1797Q is an audio signal processing LSI
designed for use in cassette decks.
Functions include Dolby B-C noise reduction,
recording equalizer amplifier, meter circuit
(logarithmic), bias control circuit, and playback
switching circuit. Serial control of these functions is
possible.
Features
• Few external parts
• Serial control of each functions possible
• Dolby B-C noise reduction
• Dolby S noise reduction select switch
• Recording equalizer amplifier
• Recording volume control
• Playback input select switch
• Meter circuit (logarithmic wave detection)
• Bias control circuit (left and right independent)
Applications
Cassette decks
64 pin QFP (Plastic)
Absolute Maximum Ratings (Ta=25°C)
• Supply voltage
VCC
+12
V
(between VCC and VEE)
• Operating temperature Topr
–20 to +75
°C
• Storage temperature
Tstg –65 to +150
°C
• Allowable power dissipation
PD
1.02
W
Recommended Operating Conditions
Supply voltage
VCC ±5.25 to ±6.0
V
Structure
Bipolar silicon monolithic IC
∗This IC is available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications
information may be obtained.
∗"Dolby" and the double D symbols are trade marks of Dolby Laboratories Licensing Corporation.
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—
E94X42-TE
GND
[ DECK-A ]
PB Only
HEAD
to Control IC
GND
for R-ch
DVCC
R-ch
GND
R2
PB
-EQ
VEE
GND
DVCC
VEE
GND
VEE
VCC
GND
600
C3
LINE IN
2.2µ
C1
-21dBv
PB IN2
-21dBv
2.2µ
VGS
(C)
DOLBY IREF
PB IN1
20k
R5
DVCC
DGND
REC/PB IREF
R6
27k
GND(VG)
VEE
VCC
XRESET
LATCH
CLK
DATA
BALANCE
REC LEVEL
VGS(C)
-10dBv
×1
R9
R3
50k
C2
R4
LINE IN
R1
180k
50k
R7
22k 2.2µ -10
dBv
B DECK PRE
DECK A/B
A DECK
BIAS
VGS
(C)
RVA
6.5k
R11
MPX
Filter
R12
4.7k
10k
R15
GND
-26dBv
PB
(-30dBm)
REC/PB
REC
PB
(-30dBm)
-31dBv
Dolby PB IN
SSK
GND
VEE
VEE
SSW
B/C NR
BC/S
S-NR
B/C
NR
BC/S
S-NR
Dolby
REC OUT
(-6dBm)
C9
LINE OUT
S IN
Dolby
TC2
LLS VF
HLS VF
Dolby
TC1
ANTS
22.5k
1.5k
(-6dBm)
MOA
OUT
Dolby
S-NR
Dolby B/C-NR
R25 12k
R21
(-6dBm)
1.5k
R19
R20
MOA
REC
REC/PB
12k
22.5k
R26
1.5k
1.5k
R23
REC/PB
REC
R27
PB
MOA
R24
VGS
(C)
PB
REC/PB
REC
Dolby
R16 REC IN
6.2k
R17
40k
-26dBv
(-25dBm)
OFF/ON
B/C
BC/S
REC/PB
NOR/CAL
A/B
OFF/ON
120µ/70µ
OFF/ON
NORM/HIGH
OFF/ON
-10dBv
VOL OUT
3.3k
-21dBv
PB OUT
-21dBv
Dolby-NR
Dolby-NR
Dolby-NR
Dolby-NR
METER
PB-DECK
LINE-MUTE
Tape-EQ
METAL
SPEED
REC-MUTE
VGS VGS
(C) (B)
CONTROL
6.5k
BUF OUT
R8
50k
R10
50k
Gm1
R13
2k
2.2µ
R22
L-ch
R14
2.2µ
5.6mH
40k
-14dBv
22k
C5
L1
C4
50k
(C)
VGS
R18
C6
(C)
VGS
(C) (C)
VGS VGS
GND
C7
8.2k
R28
C10
0.68µ
-23dBv
VGS
(B)
-7dBv
(-6dBm)
GND
for R-ch
7.5k
8k
4.7k
R42
(0dBm)
-1dBv
LINE OUT
-1dBv
R35
LINE
VGS
(C)
Gain 12dB up
7.5k
R34
(A)
GND
(0dBm) -6dBv
-1dBv
METER
BPF
-4.7dBv
R37 -9.6dBv
REC
Gm2
10k
-6dBv R36
R-ch
L-ch
GND
REC-EQ IN
VGS
(C)
-7dBv
(-6dBm)
SSW
22k
R30
2.2µ
R29
2.2µ
3.9k
C11
R31
∗Source Impedance 10kΩ
0.1µ
R39
10k
C8
10.3k
GND
0.068µ
R32
8k
R46 R47
GND
17k
C14
-8dBv
GND
HP
Amp
GND
220
R48
Gm3
24k
R50
40k
R51
GND
(A)
100p
VEE
100p
76k
C17
R53
MTR
HAEDPHONES
DGND
BVG
1.25v
METAL
CrO 2
GND
to METER IC
4.7µ
C19
VEE
10k
DVCC
-6dBv
GND
GND
∗Load Impedance 47kohm
REC
VM
GND
REC/PB
[ DECK-B ]
REC/PB HEAD
Bias
OSC
PB
10mH
R62
C20
220p
L2
From LINE OUT
BIAS-M
BIAS-C
BIAS-N
BIAS OUT
FQ CAL
GH CAL
REC CAL
50k
R55
-4dBv
REA
REC OUT
VCC
EQ
NORM
Bias
METER OUT
0dB=2.4v
(B)
VSG
+6dBv
Gm5
METAL
METAL
Gm4
×1
CALIBRATION
GND (A)
DGND
for R-ch
METER AC
×1
8k
R49
×1
200p
(C)
VGS
20k
20k
C16
50k
R33
GND
VGS
(C)
GND
2.5k
C12
R41
(C)
VGS
390p
R56
50k
2.8k
(C)
VGS
R40
R43
R61
50k
TO LINE IN
10k
100p
4k
10k
R44
R45
C13
8.5k
1.0µ
C15
R52
R63
R38
4.7µ
100k
R54
C18
150
3.3µ
R58 R59 R60
R57
50k
600 22k 130k
22k
—2—
10k
-6dBv
PB
-EQ
OSC
CXA1797Q
Block Diagram
PB OUT2
PB IN B2
PB IN A2
REC/PB IREF
GND
DOLBY IREF
PB IN A1
PB IN B1
PB OUT1
DOLBY PBIN1
VOLUME IN1
PB
44
45
REC-EQ
40
41
SPEED
ME TAL
120µ/70µ AMUTE
42
43
12
11
10
9
8
7
REC-EQ
120µ/70µ AMUTE
SPEED ME TAL
CAL
CAL
6
PB
REC
MOA
MOA
REC
PB
5
PB
REC
LMUTE
PB
PB
REC
LMUTE
4
LINE
LINE
46
3
47
2
CXA1797Q
48
1
VOLUME
B
DECK
A
GND
A
DECK
B
49
BUFFER OUT1
DOLBY PBIN2
VOLUME
50
BUFFER OUT2
VOLUME OUT1
VOLUME IN2
VOLUME OUT2
51
REC IN2
REC IN1
52
DOLBY TCH2
DOLBY TCH1
53
DOLBY TCL2
DOLBY TCL1
54
LINE OUT2
LINE OUT1
55
DOLBY OUT2
DOLBY OUT1
56
DOLBY S IN2
DOLBY S IN1
57
REC OUT2
VC5
VCS
REC OUT1
58
REC EQ IN2
REC EQ IN1
59
METER TC2
METER TC1
60
REC ED OUT2
REC EQ OUT1
61
38
BIAS-SW
39
BIAS2 METRL
B/C
NA
14
BIAS-SW
DOLBY
B/C NR
B/C
NM
DOLBY
B/C NR
13
BIAS1 METAL
62
BIAS2 CrO2
BIAS1 CrO2
63
37
36
BIAS2 OUT
S
15
S
B/C
33
19
18
17
16
METER1
METER2
B/C
34
35
BIAS1 OUT
RECMUTE TC
NR TC
S TC
B/C TC
64
BIAS2 NORMAL
BIAS1 NORMAL
METER OUT2
CONT
METER OUT1
DVCC
BALANCE
XRESET
VEE
LATCH
CLK
DATA
DGND
REC LEVEL
GH CAL
FQ CAL
REC CAL
VCC
32
31
30
29
28
27
26
25
24
23
22
—3—
21
AA
AA
AA
A
20
Pin Configuration
CXA1797Q
CXA1797Q
Pin Description
Pin
No.
Symbol
(Ta = 25°C, dual-power supply configuration, VCC = 5.5 V, VEE = 5.5 V, DVCC = 5.0 V)
Typical pin voltage
DC
AC
I/O
Z (in)
Equivalent circuit
Description
0.0V
–10dBv
O
—
6.5k
500
1 BUFFER OUT1
51 BUFFER OUT2
500
VCC
Recording volume
input buffer output
147
VEE
0.0V
–10dBv
O
Recording volume
output
—
6.5k
500
2 VOLUME OUT1
50 VOLUME OUT2
500
VCC
147
VEE
VCC
3 REC IN1
49 REC IN2
0.0V
–26dBv
(–25dBm)
I
40kΩ
40k
VCT
Recording input
147
VEE
—
—
—
147
36k
VEE
+0.4V
Time constant for
the HLS
330k
4 DOLBY TCH 1
48 DOLBY TCH2
13k
VCC
VEE
—4—
CXA1797Q
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
Z (in)
Equivalent circuit
Description
5 DOLBY TCL1
47 DOLBY TCL2
VEE
+0.9V
—
—
13.5k
VCC
—
480k
147
Time constant for
the LLS
VEE
0.0V
–1dBv
(0dBm)
O
—
8k
Line output
147
300
6 LINE OUT1
46 LINE OUT2
300
VCC
VEE
200
VCC
0.0V
–7dBv
(–6dBm)
O
—
Dolby S NR output
12k
147
200
7 DOLBY OUT1
45 DOLBY OUT2
VEE
8 DOLBY S IN1
44 DOLBY S IN2
0.0V
–7dBv
(–6dBm)
O
23.5kΩ
147
1.5k 22k
VCC
Dolby S NR input
VCT
VEE
—5—
CXA1797Q
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
Z (in)
Equivalent circuit
Description
0.0V
–7dBv
(–6dBm)
O
—
Recording output
147
200
9 REC OUT1
43 REC OUT2
200
VCC
VEE
VCC
Recording
0.0V
–23dBv
I
equalizer amplifier
input
50kΩ
147
50k
10 REC EQ IN1
42 REC EQ IN2
VCT
VEE
0.0V
—
—
—
DC cut
capacitance
300
11 METER AC1
41 METER AC2
300
VCC
8.5k
VEE
0.0V
–4dBV
O
—
50k
VEE
—6—
147
200
12 REC EQ OUT1
40 REC EQ OUT2
200
VCC
Recording
equalizer amplifier
output
CXA1797Q
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
Z (in)
Equivalent circuit
Description
VCC
13
39
14
38
15
37
BIAS MTL1
BIAS MTL2
BIAS CrO1
BIAS CrO2
BIAS NORM1
BIAS NORM2
VEE
+1.25V
—
I
—
Recording bias
control voltage
setting
147
VEE
VCC
16 BIAS OUT1
36 BIAS OUT2
—
—
O
Recording bias
control voltage
output
—
147
VEE
VCC
17 NR TC
18 B/C TC
34 S TC
—
—
I/O
17kΩ
17k
147
VEE
Time constant for
selecting NR mode
Time constant for
selecting B/C
mode
Time constant for
selecting S and
B/C modes
19 METER OUT1
33 METER OUT2
2.4V
—
O
—
100p
4k
DGND
VEE
—7—
76.6k
150
VCC
Meter output
(sensitivity:
65 mV/dB)
CXA1797Q
Pin
No.
Symbol
20 VEE
32 VCC
Typical pin voltage
DC
AC
–5.5V
+5.5V
—
I/O
I
Z (in)
Equivalent circuit
Description
Negative power
supply (Connect to
ground when using
a single power
supply)
Positive power
supply
—
VCC
21 XRESET
22 LATCH
23 CLK
—
—
I
2.5V
DGND
reference
—
2k
Reset signal input
(active low)
Load signal input
Clock input
DGND
VEE
VCC
24 DATA
—
—
I
2.5V
DGND
reference
—
4k
DGND
25 DGND
0V
—
I
Data input
VEE
Logic and CAL
reference
—
0V
—
I
147
100kΩ
40k
26 REC LEVEL
60k
VCC
DGND
VEE
—8—
Recording volume
adjustment
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
Z (in)
Equivalent circuit
Description
70k
CXA1797Q
Recording volume
balance
adjustment
VCC
147
2.5V
—
I
100kΩ
30k
27 REC BALANCE
DREF
VEE
VCC
28 GH CAL
29 FQ CAL
2.5V
—
I
High-frequency
gain adjustment of
recording
equalizer amplifier
Peak frequency Q
adjustment of
recording
equalizer amplifier
54kΩ
147 54k
VEE
VCC
30 REC CAL
2.5V
—
I
Recording
equalizer amplifier
gain adjustment
54kΩ
147 54k
VEE
+5.0V
—
I
—
DREF
30k
31 DVCC
30k
VCC
DGND
VEE
DVCC
—9—
Logic power
supply
(DREF = 1/2
(DVCC + DGND) is
CAL reference.)
CXA1797Q
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
Z (in)
Equivalent circuit
Description
VCC
35 RECMUTE TC
—
—
I/O
Time constant for
selecting
RECMUTE mode
17kΩ
17k
147
VEE
VCC
0.0V
–10dBv
I
Recording volume
input
50kΩ
147
50k
52 LINE IN2
64 LINE IN1
VCT
VEE
VCC
53 DOLBY PBIN2
63 DOLBY PBIN1
0.0V
–31dBv
(–30dBm)
I
40k
VCT
40kΩ
Playback input
147
VEE
0.0V
–21dBv
O
—
300
54 PBOUT2
62 PBOUT1
300
VCC
VEE
—10—
147
Head select output
of playback
equalizer amplifier
CXA1797Q
Pin
No.
Symbol
Typical pin voltage
DC
AC
I/O
Z (in)
Equivalent circuit
Description
VCC
PB IN B2
PB IN A2
PB IN A1
PB IN B1
0.0V
–21dBv
I
50kΩ
147
Head select input
of playback
equalizer amplifier
50k
55
56
60
61
VCT
VEE
57 REC IREF
VEE+
1.25V
192
VCC
—
—
Reference current
of recording
equalizer amplifier
—
147
VEE
30k
VCC
0V
—
—
—
30k
58 GND
Ground (center
capacitance when
using a single
power supply)
VEE
VCC
59 DOLBY IREF
VEE+
1.25V
—
—
—
VEE+1.25V
147
VEE
—11—
Reference current
CXA1797Q
Electrical Characteristics Table
(Ta = 25°C, dual-power supply configuration, VCC = 5.5 V, VEE = 5.5 V, DVCC = 5.0 V)
Block
Item
Conditions
Specifications
Unit
Min. Typ. Max.
Entire LSI
±5.25 ±5.5 ±6.0
V
10.5 11.0 12.0
V
25.0 40.0 55.0
mA
Recording
Recording equalizer amplifier
Recording equalizer amplifier reference output level (315 Hz)
— –4.0 —
equalizer amplifier Recording reference output level (This output level is the tape reference 0 dB which
NORM-NORM mode
generate magnetic flux of 250 nWb/m)
All of the recording equalizer amplifier blocks use this
level as their reference level.
Recording
Recording equalizer amplifier
Input level when the reference output level is 315 Hz,
–24.5 –23.0 –21.5
equalizer amplifier Recording reference input level -4 dBv
NORM-NORM mode
(For measurement, input a 315 Hz, -23 dBv signal to the
REC EQ IN pins and then measure the output level.)
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode
–1.7 –0.7 –0.3
equalizer amplifier REC-EQ frequency response 1 Input a 3 kHz signal (-20 dB level down) to the REC EQ
(3 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode
2.9 4.9 6.9
equalizer amplifier REC-EQ frequency response 2 Input an 8 kHz signal (-20 dB level down) to the REC EQ
(8 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode
7.8 10.8 13.8
equalizer amplifier REC-EQ frequency response 3 Input a 12 kHz signal (-20 dB level down) from the
(12 kHz, -20 dB)
reference to the REC EQ IN pin and then measure the
relative deviation from NORM-NS, 315 Hz mode.
Recording
CrO2-NORM mode
CrO2-tape, NORM-speed mode
2.1 3.1 4.1
equalizer amplifier REC-EQ frequency response 1 Input a 3 kHz signal (-20 dB level down) to the REC EQ
(3 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
CrO2-NORM mode
CrO2-tape, NORM-speed mode
4.5 6.5 8.5
equalizer amplifier REC-EQ frequency response 2 Input an 8 kHz signal (-20 dB level down) to the REC EQ
(8 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
CrO2-NORM mode
CrO2-tape, NORM-speed mode
8.0 11.0 14.0
equalizer amplifier REC-EQ frequency response 3 Input a 12 kHz signal (-20 dB level down) to the REC EQ
(12 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
METAL-NORM mode
METAL-tape, NORM-speed mode
3.7 4.7 5.7
equalizer amplifier REC-EQ frequency response 1 Input a 3 kHz signal (-20 dB level down) to the REC EQ
(3 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
METAL-NORM mode
METAL-tape, NORM-speed mode
5.7 7.7 9.7
equalizer amplifier REC-EQ frequency response 2 Input an 8 kHz signal (-20 dB level down) to the REC EQ
(8 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
METAL-NORM mode
METAL-tape, NORM-speed mode
8.4 11.4 14.4
equalizer amplifier REC-EQ frequency response 3 Input a 12 kHz signal (-20 dB level down) to the REC EQ
(12 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
dBv
Entire LSI
Entire LSI
Operating voltage range 1
(positive/negative dual power
supplies)
Operating voltage range 2
(single power supply)
Current consumption (ICC)
No signal, no load, VCC = ± 5.5 V
—12—
dBv
dB
dB
dB
dB
dB
dB
dB
dB
dB
CXA1797Q
Block
Item
Conditions
Specifications
Unit
Min. Typ. Max.
Recording
NORM-HIGH mode
equalizer amplifier REC-EQ frequency response 1
(5 kHz, -20 dB)
NORM-tape, HIGH-speed mode
Input a 5 kHz signal (-20 dB level down)to the REC EQ IN
pin and then measure the relative deviation from NORMNS, 315 Hz mode.
Recording
NORM-HIGH mode
NORM-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 2 Input a 15 kHz signal (-20 dB level down) to the REC EQ
(15 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
NORM-HIGH mode
NORM-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 3 Input a 20 kHz signal (-20 dB level down) to the REC EQ
(20 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
CrO2-HIGH mode
CrO2-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 1 Input a 5 kHz signal (-20 dB level down) to the REC EQ
(5 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
CrO2-HIGH mode
CrO2-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 2 Input a 15 kHz signal (-20 dB level down) to the REC EQ
(15 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
CrO2-HIGH mode
CrO2-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 3 Input a 20 kHz signal (-20 dB level down) to the REC EQ
(20 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
METAL-HIGH mode
METAL-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 1 Input a 5 kHz signal (-20 dB level down) to the REC EQ
(5 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
METAL-HIGH mode
METAL-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 2 Input a 15 kHz signal (-20 dB level down) to the REC EQ
(15 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
METAL-HIGH mode
METAL-tape, HIGH-speed mode
equalizer amplifier REC-EQ frequency response 3 Input a 20 kHz signal (-20 dB level down) to the REC EQ
(20 kHz, -20 dB)
IN pin and then measure the relative deviation from
NORM-NS, 315 Hz mode.
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode
equalizer amplifier Channel crosstalk
Alternately input a 1 kHz signal (+12 dB level up) and
(1 kHz, +12 dB, 1 kHz BPF)
measure the channel crosstalk. (Use a 1 kHz BPF.)
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode, RL = 2.7 kΩ
equalizer amplifier REC-EQ signal handling
Input a 1 kHz signal and set the output level so that THD
(1 kHz, THD = 1%, RL = 2.7 kΩ) (total harmonic distortion) is 1%. (Measure the distortion
of a +9 dB level-up signal.)
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode, RL = 2.7 kΩ
equalizer amplifier REC-EQ total harmonic distortion Input a 1 kHz, 0 dB (reference input level) signal and
(1 kHz, 0.0 dB, RL = 2.7 kΩ)
measure the distortion. (Measure the distortion as THD + N.)
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode, Rg = 5.1 kΩ
equalizer amplifier REC-EQ S/N ratio 1
With no signal, measure the noise using the "A"-WGT
("A"-WGT filter)
filter. (The measured value is indicated as the relative
value compared to the reference level.)
Recording
NORM-NORM mode
NORM-tape, NORM-speed mode
equalizer amplifier Output DC offset voltage
With no signal, measure the DC offset voltage of the REC
(REC OUT pin)
OUT pin.
—13—
–6.2 –5.2 –4.2
dB
–0.5
1.5
3.5
dB
3.0
6.0
9.0
dB
–1.7 –0.7
0.3
dB
1.4
3.4
5.4
dB
4.1
7.1
10.1
dB
1.0
2.0
3.0
dB
2.1
4.1
6.1
dB
4.3
7.3
10.3
dB
—
–90.0 –80.0 dB
9.0
11.0
—
dB
—
0.02
0.6
%
57.0 67.0
—
dB
–0.5
0.5
V
0.0
CXA1797Q
Block
Item
Conditions
Specifications
Unit
Min. Typ. Max.
Recording
NORM-NORM mode
equalizer amplifier REC-EQ mute characteristics
Recording
NORM-NORM mode
equalizer amplifier REC-EQ REC-CAL
characteristics 1
(REC-CAL = 5.0 V)
Recording
NORM-NORM mode
equalizer amplifier REC-EQ REC-CAL
characteristics 2
(REC-CAL = 0.0 V)
Recording
NORM-NORM mode
equalizer amplifier REC-EQ GH-CAL characteristics 1
(GH-CAL = 5.0 V)
Recording
NORM-NORM mode
equalizer amplifier REC-EQ GH-CAL characteristics 2
(GH-CAL = 0.0 V)
Recording
NORM-NORM mode
equalizer amplifier REC-EQ fQ-CAL characteristics
1-1
(fQ-CAL = 5.0 V)
Recording
NORM-NORM mode
equalizer amplifier REC-EQ fQ-CAL characteristics
1-2
(fQ-CAL = 5.0 V)
Recording
NORM-NORM mode
equalizer amplifier REC-EQ fQ-CAL characteristics
2-1
(fQ-CAL = 0.0 V)
Recording
NORM-NORM mode
equalizer amplifier REC-EQ fQ-CAL characteristics
2-2
(fQ-CAL = 0.0 V)
Recording volume Recording volume amplifier
Recording volume characteristics 1
(REC-VOL = 5.0 V, REC-BAL =
2.5 V)
Recording volume Recording volume amplifier
Recording volume characteristics 2
(REC-VOL = 2.0 V, REC-BAL =
2.5 V)
Recording volume Recording volume amplifier
Recording volume attenuation
(REC-VOL = 0.0 V, REC-BAL =
2.5 V)
Recording volume Recording volume amplifier
REC-VOL signal handling
(1 kHz, THD = 1%, RL = 2.7 kΩ)
Recording volume Recording volume amplifier
REC-VOL total harmonic
distortion
(1 kHz, -10.0 dBv, RL = 2.7 kΩ)
NORM-tape, NORM-speed mode, REC-MUTE ON
Input a 1 kHz signal (+12 dB level up) and measure the
attenuation when REC MUTE is on. (Use a 1 kHz BPF.)
NORM-tape, NORM-speed mode, REC-CAL = 5.0 V
Input a 1 kHz signal (-20 dB level down) and measure the
amount of change compared to when the REC-CAL
function is at the standard setting.
NORM-tape, NORM-speed mode, REC-CAL = 0.0 V
Input a 1 kHz signal (-20 dB level down) and measure the
amount of change compared to when the REC-CAL
function is at the standard setting.
NORM-tape, NORM-speed mode, GH-CAL = 5.0 V
Input an 8 kHz signal (-20 dB level down) and measure
the amount of change compared to when the GH-CAL
function is at the standard setting.
NORM-tape, NORM-speed mode, GH-CAL = 0.0 V
Input an 8 kHz signal (-20 dB level down) and measure
the amount of change compared to when the GH-CAL
function is at the standard setting.
NORM-tape, NORM-speed mode, fQ-CAL = 5.0 V
Input an 8 kHz signal (-20 dB level down) and measure
the amount of change compared to when the fQ-CAL
function is at the standard setting.
NORM-tape, NORM-speed mode, fQ-CAL = 5.0 V
Input a 12 kHz signal (-20 dB level down) and measure
the amount of change compared to when the fQ-CAL
function is at the standard setting.
NORM-tape, NORM-speed mode, fQ-CAL = 0.0 V
Input an 8 kHz signal (-20 dB level down) and measure
the amount of change compared to when the fQ-CAL
function is at the standard setting.
NORM-tape, NORM-speed mode, fQ-CAL = 0.0 V
Input a 12 kHz signal (-20 dB level down) and measure
the amount of change compared to when the fQ-CAL
function is at the standard setting.
REC-VOL = 5.0 V, REC-BAL = 2.5 V
Input a 1 kHz, -10 dBv signal to the LINE IN pin and
measure the full gain of the recording volume amplifier.
—
4.6
–88.0 –80.0 dB
6.1
7.6
dB
–8.0 –6.5 –5.0
dB
0.7
2.2
3.7
dB
–2.8 –1.3
0.2
dB
–5.9 –4.4 –2.9
dB
–8.4 –6.9 –5.4
dB
5.0
6.5
8.0
dB
4.9
6.4
7.9
dB
7.9
9.4
10.9
dB
REC-VOL = 2.0 V, REC-BAL = 2.5 V
–10.2 –8.7 –7.2 dB
Input a 1 kHz, -10 dBv signal to the LINE IN pin and
measure the attenuation of the recording volume
amplifier.
REC-VOL = 0.0 V, REC-BAL = 2.5 V
— –86.0 –80.0 dB
Input a 1 kHz, +2 dBv signal and measure the maximum
volume attenuation of the recording volume amplifier.
(Use a 1 kHz BPF.)
REC-VOL = 2.0 V, REC-BAL = 2.5 V, RL = 2.7 kΩ
12.0 12.5 —
dB
Input a 1 kHz signal and set the input level so that the THD is
1%. (Measure the distortion when the output is +2 dBv.)
REC-VOL = 2.0 V, REC-BAL = 2.5 V, RL = 2.7 kΩ
— 0.15 0.5
%
Input a 1 kHz, -10 dBv signal (reference input level) and
measure the distortion. (Measure the distortion as THD +
N.)
—14—
CXA1797Q
Block
Item
Conditions
Specifications
Unit
Min. Typ. Max.
Recording volume Recording volume amplifier
REC-VOL S/N ratio 1
("A"-WGT filter)
Recording volume Recording volume amplifier
Output DC offset voltage
(VOL OUT pin)
Recording volume Recording volume amplifier
REC-VOL balance
characteristics 1
(REC-VOL = 5.0 V, REC-BAL =
0.0 V)
Recording volume Recording volume amplifier
REC-VOL balance
characteristics 2
(REC-VOL = 5.0 V, REC-BAL =
5.0 V)
Recording volume Recording volume amplifier
Channel crosstalk
(REC-VOL = 5.0 V, REC BAL =
2.5 V)
Recording volume Input buffer gain
(1 kHz, -10.0 dBv)
Line amplifier
Line amplifier gain
(1 kHz, -30 dBm)
Line amplifier
Line amplifier
Signal handling
(1 kHz, THD = 1%)
Line amplifier
Line amplifier total harmonic
distortion
(1 kHz, -30 dBm)
Line amplifier
Line amplifier S/N ratio
("A"-WGT filter)
Line amplifier
Line amplifier
Line amplifier
Line amplifier
Line amplifier
Output DC offset voltage
(LINE OUT pin)
Line amplifier
MUTE mode characteristics
(1 kHz BPF)
Line amplifier
Line amplifier
Channel crosstalk
(1 kHz, -14.0 dBv, 1 kHz BPF)
Level meter
Level meter amplifier
Level meter characteristics 1
(REC IN = 1 kHz, -26 dBv)
REC-VOL = 5.0 V, REC-BAL = 2.5 V
80.0 83.0 —
dB
With no signal, measure the noise using an "A"-WGT
filter. (The measured value is indicated as the relative
value compared to the full-gain level.)
REC-VOL = 5.0 V, REC-BAL = 2.5 V
–0.15 0.0 0.15
V
With no signal, measure the DC offset voltage of the VOL
OUT pin.
REC-VOL = 5.0 V, REC-BAL = 0.0 V (1 kHz BPF)
— –96.0 –60.0 dB
Input a 1 kHz, +2 dBv signal and measure the attenuation
of VOL OUT 1. (Input -10 dBv and confirm that there is no
attenuation at VOL OUT 2.)
REC-VOL = 5.0 V, REC-BAL = 5.0 V (1 kHz BPF)
Input -10 dBv and confirm that there is no attenuation at
VOL OUT 1. (Input a 1 kHz, +2 dBv signal and measure
the attenuation of VOL OUT 2.)
REC-VOL = 5.0 V, REC-BAL = 2.5 V
Alternately input a 1 kHz, +2 dBv signal, and measure the
channel crosstalk. (Use a 1 kHz BPF.)
–1.0
—
0.0
1.0
dB
–98.0 –80.0 dB
Input a 1 kHz, -10 dBv signal to the LINE IN pin and
measure the gain at the BUF OUT pin.
–1.0
0.0
1.0
dB
PB mode
Input a 1 kHz, -30 dBm signal to the DOLBY PBIN pin
and measure the output level at the LINE OUT pins.
PB mode
Input a 1 kHz signal and set the output level so that the
THD is 1%.
PB mode
Input a 1 kHz, -30 dBm signal (reference input level) and
measure the distortion. (Measure the distortion as THD + N.)
–1.0
0.0
1.0
dBm
12.0 12.6
—
dB
0.5
%
—
0.02
PB mode
80.0 82.5 —
dB
With no signal, measure the noise using an "A"-WGT
filter. (The measured value is indicated as the relative
value compared to the reference level.)
REC mode
–0.2 –0.1 0.2
V
With no signal, measure the DC offset voltage of the LINE
OUT pin.
PB, MUTE mode
— –107.0 –80.0 dB
Input a 1 kHz, -18 dBm signal to the DOLBY PB IN pin
and measure the attenuation when LINE MUTE is on.
(Use a 1 kHz BPF.)
PB mode
— –94.0 –80.0 dB
Alternately input a 1 kHz, -18 dBm signal to the DOLBY
PB IN pin and measure the channel crosstalk. (Use a 1
kHz BPF.)
METER ON, REC mode
2.5 2.8 3.1
V
Input a 1 kHz, -26 dBv signal to the REC IN pin and
measure the output DC voltage at the METER pin.
—15—
CXA1797Q
Block
Item
Conditions
Specifications
Unit
Min. Typ. Max.
Level meter
Level meter amplifier
Level meter characteristics 2
(REC IN = 1 kHz, -22 dBv)
Level meter
Level meter amplifier
Level meter characteristics 3
(REC IN = 1 kHz, -36 dBv)
Level meter
Level meter amplifier
Level meter characteristics 4
(REC IN = 1 kHz, -46 dBv)
Level meter
Level meter amplifier
Level meter characteristics 5
(REC IN = no signal)
Level meter amplifier
Level meter CAL characteristics
(REC IN = 1 kHz, -58 dBv)
Level meter
Playback input
switch
Playback input switch gain
(PB IN = 1 kHz, -21 dBv)
Playback input
switch
Playback input switch
Signal handling
(1 kHz, THD = 1%)
Playback input switch
Total harmonic distortion
(1 kHz, -21 dBv)
Playback input
switch
Playback input
switch
Playback input switch
S/N ratio
("A"-WGT filter)
Playback input
switch
Playback input switch
A/B DECK crosstalk
A-DECK mode
Playback input
switch
Playback input switch
Output DC offset voltage
(PB OUT pin)
Bias maximum output voltage
BIAS SW
BIAS SW
NORMAL mode
Bias output voltage 1
BIAS SW
CrO2 mode
Bias output voltage 2
BIAS SW
METAL mode
Bias output voltage 3
METER ON, REC mode
2.75
Input a 1 kHz, -22 dBv (+4 dB level up) signal to the REC
IN pin and measure the output DC voltage at the METER
pin.
METER ON, REC mode
1.85
Input a 1 kHz, -36 dBv (-10 dB level down) signal to the
REC IN pin and measure the output DC voltage at the
METER pin.
METER ON, REC mode
1.2
Input a 1 kHz, -46 dBv (-20 dB level down) signal to the
REC IN pin and measure the output DC voltage at the
METER pin.
METER ON, REC mode
—
With no signal, measure the DC offset voltage at the
METER pin.
CAL ON, REC mode
1.2
Input a 1 kHz, -58 dBv (-32 dB level down) signal to the
REC IN pin and measure the output DC voltage at the
METER pin.
Input a 1 kHz, -21 dBv signal to the PB IN pin and
–22.0
measure the level.
A-DECK mode
Input a 1 kHz signal to the PB IN1 pin and set the output
level so that the THD is 1%.
A-DECK mode
Input a 1 kHz, -10 dBv signal (input reference level) to the
PB IN1 pin and measure the distortion. (Measure the
distortion as THD + N.)
A-DECK mode
With no signal, measure the noise using the "A"-WGT
filter. (The measured value is indicated as the relative
value compared to the reference level.)
A-DECK mode
Input a 1 kHz, -9 dBv (+12 dB level up) signal to the BDECK side and measure the A/B-DECK crosstalk. (Use a
1 kHz BPF.)
A-DECK mode
With no signal, measure the DC offset voltage of the PB
OUT pin.
BIAS ON mode, RL = 4.7 kΩ
Measure the output DC voltage of the BIAS OUT pin.
NORMAL mode
Set the external feedback resistance to 56 kΩ, 11 kΩ,
11 kΩ, and 11 kΩ, and measure the output DC voltage of
the BIAS OUT pin.
CrO2 mode
Set the external feedback resistance to 56 kΩ, 11 kΩ,
11 kΩ, and 11 kΩ, and measure the output DC voltage of
the BIAS OUT pin.
METAL mode
Set the external feedback resistance to 56 kΩ, 11 kΩ,
11 kΩ, and 11 kΩ, and measure the output DC voltage of
the BIAS OUT pin.
—16—
3.05 3.35
V
2.15 2.45
V
1.5
1.8
V
0.01
0.1
V
1.5
1.8
V
–21.0 –20.0 dBv
12.0 30.0
—
dB
0.02
0.5
%
80.0 84.0
—
dB
—
—
–89.0 –80.0 dB
–0.2
0.0
0.2
V
4.8
5.0
—
V
–2.4 –2.2 –2.0
V
–0.75 –0.5 –0.25
V
4.2
4.5
4.8
V
CXA1797Q
Block
Item
Conditions
Specifications
Unit
Min. Typ. Max.
DOLBY
Dolby reference level
DOLBY
REC mode
REC IN level
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
Value at the Dolby reference level of the REC OUT pin
REC mode, NR off, f = 1 kHz
Input a signal to the REC IN pin and measure the level at
which the level of the DOLBY OUT pin reaches -6 dBm.
PB mode
PB mode, NR off, f = 1 kHz
PB IN level
Input a signal to the NR PB IN pin and measure the level
at which the level of the DOLBY OUT pin reaches
-6 dBm.
B type encoding
REC, Dolby B mode
Boost characteristics 1
Input a 500 Hz, -25 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
B type encoding
REC, Dolby B mode
Boost characteristics 2
Input a 5 kHz, -25 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
B type encoding
REC, Dolby B mode
Boost characteristics 3
Input a 10 kHz, -40 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
B type encoding
REC, Dolby B mode
Boost characteristics 4
Input a 10 kHz, 0 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
C type encoding
REC, Dolby C mode
Boost characteristics 1
Input a 500 Hz, -60 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
C type encoding
REC, Dolby C mode
Boost characteristics 2
Input a 500 Hz, -25 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
C type encoding
REC, Dolby C mode
Boost characteristics 3
Input a 2 kHz, -60 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
C type encoding
REC, Dolby C mode
Boost characteristics 4
Input a 2 kHz, -25 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
C type encoding
REC, Dolby C mode
Boost characteristics 5
Input a 5 kHz, -25 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
C type encoding
REC, Dolby C mode
Boost characteristics 6
Input a 10 kHz, 0 dB signal to the REC IN pin and
measure the boost at the REC OUT pin.
PB mode
PB, Dolby off mode
Frequency response
Input a 20 kHz, -30 dBm signal to the NR PB IN pin and
measure the output at the REC OUT pin.
REC mode
REC, NR off mode
Signal handling
Input a 1 kHz signal and set the output level so that the
THD is 1%. (Measure the distortion using a signal
boosted 13.5 dB from the reference.)
NR OFF total harmonic distortion REC, NR off mode
Input a 1 kHz, +10 dB signal to the REC IN pin and measure
the distortion. (Measure the distortion as THD + N.)
Dolby B total harmonic distortion REC, Dolby B mode
Input a 1 kHz, +10 dB signal to the REC IN pin and measure
the distortion. (Measure the distortion as THD + N.)
—17—
—
–6.0
—
dBm
–26.0 –25.0 –24.0 dBm
–31.0 –30.0 –29.0 dBm
1.4
2.9
4.4
dB
3.9
5.4
6.9
dB
9.7
10.4 11.4
dB
–1.1
0.4
1.9
dB
14.2 16.2 18.2
dB
7.2
11.2
dB
18.7 20.7 22.7
dB
5.4
7.4
9.4
dB
3.5
5.5
7.5
dB
–5.5 –3.5 –1.5
dB
9.2
–7.5 –6.0 –4.5 dBm
13.5 15.8
—
dB
—
0.02 0.15
%
—
0.04
%
0.2
CXA1797Q
Block
Item
Conditions
Specifications
Unit
Min. Typ. Max.
DOLBY
Logic
Dolby C total harmonic distortion REC, Dolby C mode
—
Input a 1 kHz, +10 dB signal to the REC IN pin and measure
the distortion. (Measure the distortion as THD + N.)
REC mode
REC, Dolby C mode, Rg = 5.1 kΩ
60.0
Dolby C S/N ratio
With no signal, measure the noise using the CCIR/ARM
filter. (The measured value is indicated as the relative
value compared to the DOLBY OUT level.)
PB mode
PB, NR off mode
—
Recording → playback crosstalk Input a 1 kHz, +10 dB signal to the REC IN pin and
measure the REC → PB crosstalk. (Use a 1 kHz BPF.)
REC mode
REC, NR off mode
—
Playback → recording crosstalk Input a 1 kHz, +10 dB signal to the NR PB IN pin and
measure the PB → REC crosstalk. (Use a 1 kHz BPF.)
REC mode
PB, NR off mode
—
Channel crosstalk
Input a 1 kHz, +10 dB signal to the REC IN pin and
measure the channel crosstalk. (Use a 1 kHz BPF.)
PB mode
PB, NR off mode
—
Channel crosstalk
Input a 1 kHz, +10 dB signal to the NR PB IN pin and
measure the channel crosstalk. (Ues a 1 kHz BPF.)
REC mode
REC mode, NR off → B type
–100
Output DC offset voltage 1
With no signal, measure the deviation in the output DC
(REC OUT pin)
offset voltage at the REC OUT pin when switching from
NR off mode to B type mode.
REC mode
REC mode, NR off → C type
–100
Output DC offset voltage 2
With no signal, measure the deviation in the output DC
(REC OUT pin)
offset voltage at the REC OUT pin when switching from
NR off mode to C type mode.
High level input voltage
ViH
3.5
Logic
Low level input voltage
ViL
—
—
1.5
V
Logic
Clock frequency
fck
—
—
500
kHz
Logic
Clock pulse width
tw
1
—
—
µs
Logic
Data setup time
tsu(DATA→CLK)
1
—
—
µs
Logic
Data hold time
tH(CLK→DATA)
1
—
—
µs
Logic
Latch pulse width
tw(DATA)
1
—
—
µs
Logic
Latch setup time
ts(LATCH→DATA)
1
—
—
µs
Logic
Latch hold time
tH(CLK→LATCH)
1
—
—
µs
Logic
Reset pulse width
tw(XRST)
1
—
—
µs
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
DOLBY
—18—
0.08
0.3
%
61.0
—
dB
–79
–70
dB
–90
–70
dB
–84
–65
dB
–85
–65
dB
—
100
mV
—
100
mV
—
—
V
S506
S505
S504
S503
S502
S501
Oscilloscope
Distortion
Analyzer
GND
AC
Voltmeter
CCIR
1kHz BPF
DIN Audio
Amp
"A" WTG
30dB
Amp
Filter module
0dB
DC
Voltmeter
•0dB=1Vrms for other tests
•0dBm=.7746Vrms for Dolby
R100*
GND
1.2k
R1*
10k
0dBv
R2*
S1
S2
138.5k
0dBm
10k
R4
R3
100
47k
0dBv
R5*
47k
0dBv
R6*
47k
0dBv
R7*
S3
S4
47k
0dBv
R7*
100
R9
10k
R10
138.5k
0dBv
R11*
R12*
10k
0dBV
0dB
•DC MEAS
•AC IN
•AC MEAS
•V EE
•G ND
5.1k
5.1k
10k
10k
R13*
R14*
R15*
R16*
R19*
S6
64
63
0.1µ -10dBV
C1
-21dBV
61
VOLUME IN1
1
51
DOLBY PBIN1
PB OUT1
PB IN B1
PB IN A1
60
62
DOLBY IREF
59
-21dBV
GND
0.1µ -30dBm
0.1µ
S7 C2
C4
0.1µ
C5
PB IREF
58
PBIN A2
PBIN B2
PB OUT2
DOLBY PBIN2
VOLUME IN2
57
-21dBV
0.1µ -21dBV
C3
S8
S9
S16
0.1µ
56
55
54
53
52
0.1µ -21dBV
S10 C6
0.1µ -21dBV
S11 C7
C9
C10
-10dBV
-30dBm
0.1µ
C8
S12
S13 0.1µ
2.7k
5.1k
R18*
5.1k
S5A
R17*
2.7k
5.1k
5.1k
R20*
R22*
R21*20k
5.1k
27k
R23*
R24*
5.1k
5.1k
5.1k
R27*
10k
R28
10k
5.1k
5.1k
R32*
R25*
R26*
S5B
R29*
R30*
R31*
•GND
S15
BUFFER OUT2
2.7k
0.1µ
R36
C12
C14
42
43
44
45
46
47
48
49
REC IN2
50
VOLUME OUT2
2
VOLUMU OUT1
3
C16
-25dBm
R40
S25
R34
100
S15
S18
S19B
*R44
S23
C18
R38
100
S21
2.7k
0.1µ
REC IN1
10k
*R48
0.1µ
10k
S24
50kΩ
DOLBY TCH2
C13
-10dBV
0.1µ
S22 C15
-25dBm
•VEE
BUFFER
OUT1
DOLBY TCH2
4
DOLBY TCH1
•AC IN
R42
10k
*R46
75.6k
0dBm
R50
10k
0.1µ
C20
C22
5
S27
DOLBY TCL1
6
LINE OUT1
10k
0.01µ
R52
0.068µ
C24
C26
C25
7
DOLBY OUT1
S36
8
DOLBY S IN1
CXA1797Q
9
DOLBY REC OUT1
10
REC EQ IN1
R54
S28B
10k
0.01µ
S30
2.7k
2.7k
0.1µ
R60
C28
C32
37
BIAS2 NOMAL
38
BIAS2 CrO2
39
BIAS2 METAL
40
REC EQ OUT2
41
11
33
34
35
36
BIAS2 OUT
BOOST2
BOOST1
100
R58
S32
10k
*R78
5.1k
32k
0dBv
S45B
12
S47
R88
13
11k
R91
R89
15
14
56k
R79
R94
56k
16
S54
17
S56
18
C42
B/C TC
R98
19
VEE
XRESET
LATCH
CLK
DATA
DGND
REC LEVEL
GH CAL
FQ CAL
DVCC
BALANCE
10k
S60
3.3µ
R104
10k
20
22
21
23
24
25
26
27
28
29
31
30
32
V29
VCC
V28
0
10k
R100
10k
S58 R102
4.7µ
C44
V27
V26
RQC CAL
METER
OUT1
0
0
R84
S52B
R96
3.3k
C40
NR TC
4.7µ
3.3µ
10k
V30
0
0
10µ
C45
D22
D21
D23
D24
10µ
C46
10µ
LOAD
XRESET
CLK
DATA
GND
C47
GND
R86
10k
R92
11k
11k
11k
R90
S51
3.3k
C39
R56
10k
R62
S35
S388
R70
100
R74
*R76
*R80
C36
0.68µ
C38
R82
2.7k
0.1µ
-4dBv
100
S49
11k
BIAS CrO2
BIAS OUT1
100
0dBm
R72
2.7k
0.1µ
C34
5.1k
-23dBv 0.1µ
RECMUTE TC
REC EQ OUT1
BIAS METAL
BIAS NORMAL
S33B
S37
S53
R97
•DC MEAS
-21dBV
LINE OUT2
S26
0.068µ
4.7µ
S55
•AC MEAS
10k
DOLBY OUT2
0.1µ
-6dBm
C37
R81
C41
10k
10k
R99
Audio
SG
100k
1.2k
C11
R35
R39
2.7k
R43*
10k
DOLBY S IN2
-1dBv
0.1µ
0.1µ
S43
C33
-23dBv
0.1µ
C35
5.1k
S TC
0.68µ
S45A
S46
-4dBv
0.1µ
R87
4.7µ
S57
Electrical Characteristics Measurement Circuit
S14
100
S19A
S20
C17
0.1µ
R49
C21
DOLBY REC OUT1
C27
-6dBm
0.1µ
-6dBm
C31
R69
2.7k
R75
R77*
METER
OUT2
S50
R95
C43
10k
R101
S59
R103
R101*
GND
S14
R33
0.1µ
2.7k
R37 S17
100
R41
10k
R45*
0.1µ
R47*
75.9k
0dBm
C19
0.01µ
10k
R51
R53
2.7k
S33A
R59
2.7k
10k
R61 S34
100
R71 S39
S38A
10k
R73* S41
5.1k
R79*
100
32.1k
0dBv
2.7k
100
R85 S48
11k
10k
S52A
10k
-6dBm
0.01µ S28A
S29
R55
REC EQ IN2
C23
10k
S31
100
R57
—19—
10k
R83
10k
GND
A
5V
A
DC Ammeter
GND
VEE
VCC
Power
Supply
A
DC Ammeter
DC Ammeter
CXA1797Q
4.7µ
10k
C4
R2
220p
L2
BIAS
OSC
B-R
A-R
A-L
B-L
OSC
BIAS
C2
C1
GND
LINE IN
REC/PB
LINE IN
GND
REC/PB
10mH
220p
L1
R1
C3
10mH
10k
4.7µ
GND GND
22k
GND
L3
4.7k
PB IN B1
PB IN A1
DOLBY
PBIN1
-14dBv
2
50
VEE
3
49
4
48
R21
VEE
7.5k
-6dBV
5
47
4.7k
R25
6
46
7
45
Dolby
S-NR
8
44
GND
GND
42
41
CXA1797Q
43
GND
12
40
VEE
13
39
14
38
15
37
16
36
130k
2.2k
600
R37
R35
R33
GND GND GND
35
34
19
33
FQ CAL
REC CAL
DVCC
VCC
to METER IC
GND
6.2k
R16
Fillter
MPX
VEE
-26dBv
-6dBV
R20
VEE
GND
GND
LINE OUT R-ch
7.5k
4.7k
R24
Dolby
S-NR
9
10
GND
11
GND
GND
R34
2.2k
R32
600
VEE
R36
130k
GND GND GND
18
17
50k
C37
0.68µ
C36
100µ
VCC
C35
0.68µ
100µ
C34
VEE
to METER IC
VEE
XRESET
LATCH
CLK
DATA
DGND
REC
LEVEL
BALANCE
1
51
6.2k
R17
GND
GH CAL
IN1
2.2µ VOLUME
C12
22k 2.2µ
GND
GND
DOLBY
IREF
R7 PB OUT1
20k
R8
27k
MPX
Filter
GND
GND
GND
GND
R44
DGND
M icro
Processr
DVCC
0.68µ
C38
100µ
C39
DVCC
HP
Amp
HP
Amp
R45
220
220
R46
HAEDPHONES
GND
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.
GND
PB IN A2
PB IN B2
R9 REQ IREF
4.7k
R4 C11
390p 5.6mH
22k
2.2µ
R6
PBEQ
C6
2.2µ
PBEQ
C7
2.2µ
PBEQ
C8
2.2µ
PBEQ C8
R11 PB OUT2
2.2µ
22k 2.2µ
C13
C9 L4
5.6mH
390p
R10
DOLBY
PBIN2
R13 C14
R4
VOLUME
IN2
180k
-14dBv
58
59
60
61
62
64
3.3k
R14
63
R15
R23
56
BUFFER
OUT1
VOLUME
OUT1
GND
VOLUME OUT2
REC IN1
ON/OFF
DOLBY S IN1
GND
BUFFER OUT2
2k
2.2µ
DOLBY TCH2 C18
DOLBY
TCH1
C17
2.2µ
DOLBY
TCL1
0.1µ
C19
2k
C15
R18
GND
0.1µ
DOLBY TCL2 C20
100k
4.7µ
C21
R22
R3
DOLBY OUT2
DOLBY OUT1
10k
REC
OUT2 C24 R28 R29
22k
REC
C23 OUT1
R26 R27
R12
0.068µ
C27
LINE OUT2
0.068µ
LINE OUT1
4.7µ
100k
1µ
VEE
1µ
REC EQ OUT2
REC EQ OUT1
VEE
BIAS2
CrO 2
BIASI
NORMAL
BIAS1 CrO2
R5
2.2µ 8.2k
REC EQ IN2 C26
8.2k 2.2µ
C25 REC EQ IN1
22k
BIAS1 METAL
R30
BIASI OUT
10k
DOLBY S IN2
3.9k 0.68µ
2.2µ
METER AC2 C28
2.2µ
C27 METER AC1
3.9k
0.68µ
NR TC
10k
10k
R19
C16
REC IN2
R31
BIAS2 METAL
22k
BIAS2 OUT
BIAS2
NORMAL
22k
180k
4.7µ
C32
S TC
ON/OFF
3.3k
52
53
54
3.3µ
57
55
32
31
30
RECMUTE
C30
TC
B/C TC
4.7µ
C31
R42
50k
4.7µ
C34
C29
R41
50k
METER
OUT2
METER OUT1
4.7µ
C33
R40
50k
29
28
27
26
25
24
23
22
21
20
GND
R38
GND
—20—
3.3µ
R39
50k
R43
DGND
LINE OUT L-ch
GND
Application Circuit
CXA1797Q
CXA1797Q
Description of Operation
1. Logic Usage
The CXA1797Q is controlled by 11-bit serial data.
Name
SPEED
METAL
EQ
A/B
METER
PB/REC
LMUTE
RMUTE
BC/S
B/C
NR ON/OFF
D1
D2
D3
D4
D5
D6
D7
D8
D9 (Note 1)
D10
D11
Function (DATA 1) (Note 2)
NORM
METAL OFF
120µs
DECK A
METER GAIN NORM
PB MODE
LINE MUTE ON
REC MUTE ON
DOLBY NR B or C
DOLBY NR B
DOLBY NR OFF
Function (DATA 0)
HIGH
METAL ON
70µs
DECK B
METER GAIN HIGH (+12dB)
REC MODE
LINE MUTE OFF
REC MUTE OFF
DOLBY NR S
DOLBY NR C
DOLBY NR ON
Note 1) S mode takes precedence over other noise reduction modes. (When turning noise reduction off,
select BC mode.)
Note 2) All data is initialized to "1" when a reset is executed.
2. Serial Data Format
An overview of the serial data format is shown below.
When using CLK and LATCH as normal high:
DATA is read at the
rising edge of CLK.
CLK
DATA
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11
LATCH low : hold
LATCH high : load
Reset operation when low
(when reset is required)
LATCH
XRST
When using CLK and LATCH as normal low (Note 3):
DATA is read at the
rising edge of CLK.
CLK
DATA
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11
LATCH low : hold
LATCH high : load
Reset operation when low
(when reset is required)
LATCH
XRST
Note 3) In this instance, have the LATCH signal rise while CLK is high.
—21—
CXA1797Q
3. Timing Chart of 11-bit Serial Data Interface
tWC
3.5V
CLK
1.5V
tSDK
tHCD
tWD
3.5V
D1
DATA
D2
1.5V
tSLD
LATCH
1.5V
3.5V
CLK
tHLC
tHCL
DATA
D10
D11
3.5V
LATCH
1.5V
XRESET
1.5V
tWR
—22—
tWC
CXA1797Q
4. Control pin usage
1) REC VOL
Connect a 50 kΩ variable resistor to this pin; this pin controls the electronic volume according to the
voltage (between DVCC and DGND) applied to this pin.
(Although other resistances and voltages can be used, the gain when the volume is at the center will
differ.)
2) REC BAL
This pin controls the electronic volume balance.
(Both channel sounds are output when voltage of (DVCC + DGND)/2 is applied to this pin or when it is
open. When DVCC voltage is applied, only the CH1 sound is output, and when DGND voltage is
applied, only the CH2 sound is output.)
3) REC CAL
This pin adjusts the overall gain for the recording equalizer amplifier. (The gain is at the center when
voltage of (DVCC + DGND)/2 is applied to this pin or when it is open.)
4) FQ CAL
This pin adjusts the high-frequency peak Q value for the recording equalizer amplifier. (FP and GP also
change.)
(The value is at the center when voltage of (DVCC + DGND)/2 is applied to this pin or when it is open.)
5) GH CAL
This pin adjusts the middle/high frequency gain for the recording equalizer amplifier.
(The gain is at the center when voltage of (DVCC + DGND)/2 is applied to this pin or when it is open.)
GP/FP
Gain (dB)
Low-frequency boost (external)
RECCAL
GH
Frequency (Hz)
—23—
FQ
CXA1797Q
5. NR TC, BC TC, STC, RMUTE TC
These time constants are set in order to prevent the generation of a popping noise when one of the
switches operates. In addition, these functions can be controlled directly by applying voltage from an
external source. (In this case, the capability to drive 17 kΩ impedance is required.)
17kΩ
6. Meter circuit
The CXA1797Q meter circuit is a logarithmic detector.
The circuit has a sensitivity of 65 mV/dB and is designed to generate 2.8 V when the reference signal is
input.
This circuit has the temperature characteristics depend on Vt (= KT/q).
As a result, in order to satisfy the specifications, sufficient warmup time is required.
If METER GAIN is set to HIGH mode, the sensitivity is increased by 12 dB.
The METER AC pin is used to detect only the AC component, the low-frequency cut-off is determined by
the 8.5 kΩ internal resistance and the capacitance connected to this pin.
(With approximately 20 kHz at 1 µF, the high-frequency cut-off is fixed at 20 kHz.)
7. Bias circuit
This circuit generates the DC voltage that controls the bias oscillator.
The BIASOUT voltage is specified so that voltage equal to the internal reference voltage (VEE + 1.25 V) is
generated at a pin selected according to the tape mode (BIAS N, BIAS C, or BIAS M).
The BIASOUT pin is provided with a protective resistor of 147 Ω. Take into account the corresponding
voltage drop when the load current is high.
147Ω
NORM
VEE
METAL
CrO2
VEE
—24—
CXA1797Q
REC EQ frequency response
30
Vcc, VEE = ±5.5V
0dB = NORM Tape—NORM SPEED
315Hz, —24dBV
NORM—NORM
CrO 2—NORM
METAL—NORM
NORM—HIGH
CrO 2—HIGH
METAL—HIGH
Output response (dB)
20
10
0
–10
100
10
1k
100k
10k
Frequency (Hz)
REC EQ total harmonic distortion
10.0
REC EQ load characteristics
14.0
12.0
VCC, VEE = ±5.5V
NORM Tape—NORM SPEED
0dB = —4dBV
THD+N = 1%
10.0
Output level (dB)
Distortion (%)
VCC, VEE = ±5.5V
NORM Tape—NORM SPEED
0dB = —4dBV, RL = 2.7k
315Hz
1kHz
3kHz
6.3kHz
10kHz
15kHz
1.0
f=315Hz
f=1kHz
8.0
6.0
4.0
2.0
0
0.1
100
–12
–8
–4
0
4
8
12
Output level (dB)
—25—
500
1k
5k
10k
Load resistance (Ω)
50k
100k
CXA1797Q
REC CAL frequency response
30
VCC, VEE = ±5.5V
NORM Tape—NORM SPEED
FQ CAL and GH CAL: open
0dB = 315Hz, —24dBV
Output response (dB)
20
10
REC CAL = 5.0V
REC CAL = 2.5V
0
REC CAL = 0V
–10
10
100
1k
Frequency (Hz)
10k
100k
GH CAL frequency response
30
VCC, VEE = ±5.5V
NORM Tape—NORM SPEED
REC CAL and FQ CAL: open
0dB = 315Hz, —24dBV
Output response (dB)
20
10
GH = 5.0V
0
GH = 2.5V
–10
10
100
GH = 0V
1k
Frequency (Hz)
10k
100k
FQ CAL frequency response
30
Output response (dB)
20
VCC, VEE = ±5.5V
NORM Tape—NORM SPEED
REC CAL and GH CAL: open
0dB = 315Hz, —24dBV
10
FQ CAL = 5.0V
0
FQ CAL = 0V
FQ CAL = 2.5V
–10
10
100
1k
Frequency (Hz)
—26—
10k
100k
CXA1797Q
Output level vs. REC CAL voltage
VCC, VEE = ±5.5V
NORM Tape—NORM SPEED
GH CAL, FQ CAL = 2.5V
0dB = REC CAL, FQ CAL, GH CAL: open
—20dB (at 315Hz, —4dBv)
315Hz
3kHz
8kHz
12kHz
6.0
2.0
0
–2.0
–4.0
–6.0
1.0
0
2.0
4.0
3.0
5.0
REC CAL pin voltage (V)
Output level vs. GH CAL voltage
VCC, VEE =±5.5V
NORM Tape—NORM SPEED
REC CAL, FQ CAL = 2.5V
0dB = REC CAL, FQ CAL, GH CAL: open
—20dB (at 315Hz, —4dBv)
4.0
Output level (dB)
315Hz
3kHz
8kHz
12kHz
2.0
0
–2.0
–4.0
0
1.0
2.0
3.0
4.0
5.0
GH CAL pin voltage (V)
Output level vs. FQ CAL voltage
8.0
VCC, VEE =±5.5V
NORM Tape—NORM SPEED
REC CAL, GH CAL = 2.5V
0dB = REC CAL, FQ CAL, GH CAL: open
—20dB (at 315Hz, —4dBv)
315Hz
3kHz
8kHz
12kHz
6.0
4.0
Output level (dB)
Output level (dB)
4.0
2.0
0
–2.0
–4.0
–8.0
0
1.0
2.0
3.0
FQ CAL pin voltage (V)
—27—
4.0
5.0
CXA1797Q
REC VOL gain vs. Control voltage
REC VOL total harmonic distortion
10
VCC, VEE = ±5.5V
REC LEVEL: 2.0V
0dB = –10dBV
f = 1kHz
0
–10
1.0
Distortion (%)
REC VOL gain (dB)
–20
–30
–40
–50
0.1
–60
–70
VCC, VEE = ±5.5V
NORM Tape— NORM SPEED
Input: 1kHz, –10dBv
–80
0.01
–8
0
1.0
2.0
3.0
4.0
–4
REC LEVEL control voltage (V)
REC balance characteristics
10
0
–10
REC balance gain (dB)
–20
–30
–40
1ch
2ch
–50
–60
–70
VCC, VEE = ±5.5V
NORM Tape—NORM SPEED
REC CAL, FQ CAL, GH CAL = 2.5V
0dB = REC LEVEL = 5.0V
BALANCE = 2.5V
Output for –10dBv input
–80
–90
–100
0
1.0
2.0
3.0
4.0
0
4
8
Output level (dB)
5.0
5.0
REC balance control voltage (V)
—28—
12
CXA1797Q
NR C type encoding characteristics
NR B type encoding characteristics
12
10
–40dB
VCC, VEE = ±5.5V
0dB = Dolby Level
20
6
4
–20dB
2
Encoding boost (dB)
–30dB
–10dB
0dB
0
–2
100
500
1k
5k
–60dB
16
–50dB
12
–40dB
–30dB
8
4
–20dB
0
–10dB
–4
10k
Frequency (Hz)
0dB
100
500
200
1k
2k
5k
10k
Frequency (Hz)
NR off total harmonic distortion
NR B type total harmonic distortion
2.0
1.0
2.0
VCC, VEE = ±5.5V
Encode Mode
0dB = Dolby Level
VCC, VEE = ±5.5V
Encode Mode
0dB = Dolby Level
1.0
0.5
0.5
0.2
Distortion (%)
Distortion (%)
Encoding boost (dB)
8
VCC, VEE =± 5.5V
0dB = Dolby Level
0.1
0.05
f = 1kHz
0.1
f=100Hz
0.05
0.02
f = 100Hz
–4
f=1kHz
f = 10kHz
0.02
0.01
0.2
f=10kHz
0.01
0
4
8
12
Output level (dB)
16
–4
18
—29—
0
4
8
12
Output level (dB)
16
18
CXA1797Q
NR ripple rejection ratio 1
NR C type total harmonic distortion
2.0
1.0
VCC, VEE = ±5.5V
Encode Mode
0dB = Dolby Level
0
Ripple elimination ratio (dB)
0.5
Distortion (%)
f = 100Hz
0.2
0.1
f = 1kHz
0.05
0.02
–10
VCC Rejection on Split Supply
VCC, VEE =± 5.5V
NR off encoding mode
NR off decoding mode
NR B encoding mode
NR B decoding mode
NR C encoding mode
$
NR C decoding mode
–20
–30
$
–40
$
$
$ $ $
$
$
$ $
$
$
–50
0.01
–60
–4
0
4
8
12
16
Ripple rejection ratio (dB)
NR ripple rejection ratio 2
VEE Rejection on Split Supply
VCC, VEE = ±5.5V
NR off encoding mode
0
NR off decoding mode
NR B encoding mode
NR B decoding mode
NR C encoding mode
–10
NR C decoding mode
$
–20
$
$
100
200
$
$
$
$
$
$ $
$
–40
–50
–60
500
1k
2k
5k
200
500
1k
2k
Frequency (Hz)
Output level (dB)
–30
100
10k
Frequency (Hz)
—30—
5k
10k
CXA1797Q
Package Outline
Unit : mm
64PIN QFP(PLASTIC)
23.9 ± 0.4
+ 0.4
20.0 – 0.1
+ 0.1
0.15 – 0.05
51
0.15
64
20
1
16.3
32
+ 0.4
14.0 – 0.1
52
17.9 ± 0.4
33
+ 0.2
0.1 – 0.05
1.0
0.8 ± 0.2
19
+ 0.35
2.75 – 0.15
+ 0.15
0.4 – 0.1
± 0.12 M
PACKAGE STRUCTURE
PACKAGE MATERIAL
EPOXY RESIN
SONY CODE
QFP–64P–L01
LEAD TREATMENT
EIAJ CODE
∗ QFP064–P–1420
LEAD MATERIAL
SOLDER/PALLADIUM
PLATING
COPPER /42 ALLOY
PACKAGE WEIGHT
1.5g
JEDEC CODE
—31—