SONY CXA1498M

CXA1498S/M
Recording/Playback Equalizer Amplifier for Stereo Tape Recorder
Description
The CXA1498S/M is a bipolar IC designed as
equalizer amplifier for tape redorder recording/
playback. This IC is particularly well-suited for double
cassette deck applications. An on-chip filter serves to
greatly reduce the number of external parts.
CXA1498M
30 pin SOP (Plastic)
CXA1498S
30 pin SDIP (Plastic)
Features
• Recording equalizer amplifier × 2
(Monolithic filter eliminates the need for external
resonance circuit)
• AGC (automatic gain control) × 2
• Playback equalizer amplifier × 2
(Variable resistor eliminates the need for external
feedback resistor)
• Electronic switch for playback head
(Changes between A and B decks)
• Electronic switch for tape equalization
(120µs/70µs) (Independently for A and B decks)
• Electronic switch for metal tapes
• Electronic switch for normal/high speed dubbing
(Effective for both REC EQ and PB EQ)
• Recording mute function
(Soft mute is possible through use of an external
time constant circuit)
• DC controllable for fade IN/OUT
(Controls recording mute function)
• Playback mixing output pin provided
(For tune selection)
• Use of this IC simplifies the construction of double
cassette dubbing system
Applications
Recording/playback equalizer amplifier, playback
mixing amplifier and AGC for analog stereo tape
recorders
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage
VCC
12
• Operating temperature
Topr –20 to +75
• Storage temperature
Tstg –65 to +150
• Allowable power dissipation
PD SDIP
930
SOP
630
mW
mW
Recommended Operating Condition
Supply voltage
VCC
4.5 to 10.0
V
V
°C
°C
25
RFS
20
VG
PB EQ
CONTROL
DECK- B PB
17
VCC
MUTE
CONT
VGS
REC EQ
AGC DET
BIAS &
I REF
DECK- B PB
REC EQ
REC EQ
CONTROL
GND
9
METAL
10
AGC
TC
AGC
11
12
REC
IN
13
GND
14
GND
8
REC IN (L)
PB OUT (L)
DECK
-B EQ
SPEED
7
AGC (L)
PB FB2 (L)
I REF
AGC TC
PB FB1 (L)
6
METAL
PB IN2 (L)
MS
OUT
DECK B EQ
5
SPEED
4
I REF
3
PB IN1 (L)
PB
OUT
2
MS OUT
100k
PB FB2
PB FB1
1
REC
OUT
15
REC OUT (L)
210k
PB IN2
16
REC
OUT
VCC
DECK- A
PB IN1
REC OUT (R)
VCC
18
REC
IN
30k
DECK- A
DECK
A/B
19
AGC
30k
VG
REC MUTE
DECK A EQ
DECK A/B
RFC
23
21
22
24
RFC
DECK
DECK
REC
A/B
-A EQ
MUTE
210k
DECK
A/B
REC IN (R)
26
PB
OUT
AGC (R)
27
30
28
29
PB IN1 PB IN2 PB FB1 PB FB2
100k
RFS
PB FB2 (R)
PB FB1 (R)
PB IN2 (R)
PB IN1 (R)
PB OUT (R)
Block Diagram and Pin Configuration (Top View)
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–
E91860C49-ST
CXA1498S/M
Pin Description and Equivalent Circuit
Pin
No.
Symbol
(Ta = 25°C, VCC = 8V, no signal)
DC
I/O
I/O
voltage
resistance
Equivalent circuit
VCC
1
2
29
30
PBIN1 L
PBIN2 L
PBIN2 R
PBIN1 R
RFS
×6
0V∗1
I
1
—
Description
147
×6
Playback equalizer
amplifier input pins.
×2
2
29
30
GND
VCC
VCC
3
28
PBFB1 L
PBFB1 R
0.8V∗1
—
10p
68kΩ
RFS
7k
×3
10p
500
147
×5
147
3
×6
28
5
26
PBOUT L
PBOUT R
2.5V∗1
O
500
×6
×6
147Ω
—
Playback equalizer
amplifier output pins.
5
RFS
×5
Connection pins for
the capacitor that
determines the
playback equalizer
amplifier's time
constant
(120µs, 70µs, etc.)
×5
7k
4
—
26
10k
To 26
147
2.5V∗1
10k
100k
VCC
PBFB2 L
PBFB2 R
5
210k
×4
GND
4
27
Playback equalizer
amplifier negative
feedback pins.
VCC
27
GND
VCC
VCC
×2
6
MS OUT
2.5V∗1
147
O
147Ω
6
500
×4
GND
–2–
500
5k
Mixed output pin for
the L and R outputs of
the playback equalizer
amplifier.
CXA1498S/M
Pin
No.
Symbol
DC
I/O
I/O
voltage
resistance
Equivalent circuit
Description
VCC
VCC
Recording/playback
equalizer reference
current setting pin.
×2
7
I REF
1.2V
—
—
7
147
5p
GND
GND
8
9
SPEED
Tape speed switching
pin.
High: high speed
Low: normal speed
B EQ
B deck equalizer
switching pin.
High: 70µs EQ
Low: 120µs EQ
VCC
VCC
8
9
10
METAL
—
I
B deck metal tape
switching pin.
High: metal tape
Low: normal or CrO2 tape
147
10
—
22
23
22
23
A EQ
A deck equalizer
switching pin.
High: 70µs EQ
Low: 120µs EQ
GND
A deck/B deck
playback switching pin.
High: PBIN2
Low: PBIN1
DECK AB
VCC
VCC
×2
×2
200
11
AGC TC
0V
—
—
500
×2
11
147
×4
500
100k
GND
–3–
200
Connection pin for
the resistance and
capacitor that
determines the AGC
attack recovery time
constant.
CXA1498S/M
Pin
No.
Symbol
DC
I/O
I/O
voltage
resistance
Equivalent circuit
Description
VCC
VCC
AGC pins for varying
the input resistance
according to the input
signal level over a
range from 100kΩ to
several 10Ω.
12
12
19
AGC_L
AGC_R
19
4V
I/O
100kΩ
200
VGS
100k
5k
×4
GND
200
VCC
10k
VCC
VGS
13
18
RECIN L
RECIN R
1.8k
50k
4V
I
13
50kΩ
5p
147
18
Recording equalizer
amplifier input pins.
24k
GND
14
GND
0V
—
GND
14
—
VCC
Ground pin.
VCC
5p
40k
×3
15
16
RECOUT L
RECOUT R
4V
O
147Ω
Recording equalizer
amplifier output pins.
500
147
15
500
16
VG
× 10
GND
17
VCC
8V
—
—
VCC
4V
—
15kΩ
×2
500
147
VG
VCC
3p
30k
20
Power supply voltage
pin.
VCC
17
20
500
30k
×4
GND
–4–
To each
VGS
Connection pin for the
capacitor that eliminates
ripple at the signal
reference voltage.
CXA1498S/M
Pin
No.
Symbol
DC
I/O
I/O
voltage
resistance
Equivalent circuit
VCC
VCC
147
21
MUTE
—
I
—
Description
20k
21
20k
×3
×3
2V
Recording mute control
pin.
Permits soft mute by
connecting an external
CR time constant circuit.
GND
VCC
24
RFC
8V∗2
—
—
VCC
VCC
147
24
× 250
25
Connection pin for the
resistance and
capacitor used for
generating stable
voltage by eliminating
ripple from the power
supply voltage.
To each RFS
25
RFS
7.2V∗2
O
—
GND
Stable voltage output
pin.
∗1 The values of DC voltage require connection of bias resistance between GND and Pins 1, 2, 29 and 30,
respectively.
∗2 The values of DC voltage require connection of a resistance between Pin 24 and VCC, and a capacitor
between Pin 24 and GND for eliminating ripple, respectively.
–5–
CXA1498S/M
Electrical Characteristics
Item
Recording equalizer amplifier
Symbol
Conditions∗
Min.
Typ.
Max.
Unit
Operating voltage
Vopr
Single power supply
4.5
8.0
10.0
V
Current consumption
ICC
NORM/120µs-NORM, No signal
7.0
11.5
15.5
mA
Reference input level
VIN
NORM-NORM, 315Hz
–34.5
–33.0
–31.5
dBm
Reference output level
VOUT
NORM-NORM, 315Hz
—
–6.0
—
dBm
S/N ratio
(NORM-NORM)
SN
(A-WTG)
Rg = 5kΩ, “A”-WTG filter
60.0
63.5
—
dB
Signal handling
SH
RL = 2.7kΩ, 1kHz, THD = 1%
8.0
10.0
—
dB
Total harmonic
distortion
THD
RL = 2.7kΩ, 1kHz, 0dB
—
0.19
0.5
%
Output offset voltage
VOFF
NORM-NORM
3.8
4.13
4.5
V
FNN-1
3kHz, –20dB
–1.6
–0.4
0.8
dB
FNN-2
8kHz, –20dB
2.4
3.9
5.4
dB
FNN-3
12kHz, –20dB
6.4
8.9
11.4
dB
FCN-1
3kHz, –20dB
3.4
4.6
5.8
dB
FCN-2
8kHz, –20dB
6.1
7.6
9.1
dB
FCN-3
12kHz, –20dB
9.4
11.4
13.4
dB
FMN-1
3kHz, –20dB
3.2
4.4
5.6
dB
FMN-2
8kHz, –20dB
5.1
6.6
8.1
dB
FMN-3
12kHz, –20dB
7.6
9.6
11.6
dB
FNH-1
5kHz, –20dB
–1.4
–0.2
1.0
dB
FNH-2
15kHz, –20dB
3.9
5.7
7.5
dB
FNH-3
20kHz, –20dB
7.0
9.5
12.0
dB
FCH-1
5kHz, –20dB
3.1
4.3
5.5
dB
FCH-2
15kHz, –20dB
7.6
9.4
11.2
dB
FCH-3
20kHz, –20dB
10.3
12.8
15.3
dB
FMH-1
5kHz, –20dB
3.7
4.9
6.1
dB
FMH-2
15kHz, –20dB
7.7
9.2
10.7
dB
FMH-3
20kHz, –20dB
9.8
12.3
14.8
dB
Recording mute ratio
MT-1
NORM-NORM, 1kHz, +8dB
—
–85.0
–80.0
dB
Recording mute
characteristics
MT-2
NORM-NORM, 1kHz, 2.0V
(pin voltage)
–8.0
–6.0
–4.0
dB
AGC level
AGC-L
RIN = 10kΩ, 1kHz, –25dBm
–31.0
–29.0
–27.0
dBm
Channel balance
AGC-B
RIN = 10kΩ, 1kHz, –15dBm
–2.0
0.0
2.0
dB
AGC distortion
THD-A
RIN = 10kΩ, 1kHz, 0.0dBm
—
0.8
1.5
%
NORM-NORM mode
frequency
characteristics
CrO2-NORM mode
frequency
characteristics
METAL-NORM mode
frequency
characteristics
NORM-HIGH mode
frequency
characteristics
CrO2-HIGH mode
frequency
characteristics
METAL-HIGH mode
frequency
characteristics
AGC
(Ta = 25°C, VCC = 8.0V)
–6–
For NORMNORM at 315Hz
–20dB
For NORMNORM at 315Hz
–20dB
For NORMNORM at 315Hz
–20dB
For NORMNORM at 315Hz
–20dB
For NORMNORM at 315Hz
–20dB
For NORMNORM at 315Hz
–20dB
CXA1498S/M
Item
120µs-NORM mode
frequency
characteristics
Conditions∗
Symbol
Min.
Typ.
Max.
Unit
PB-REF
315Hz, -70dBm, Frequency
characteristics standard (0dB)
–27.0
–25.0
–23.0
dBm
F120-N
For 2.7kHz, –58.5dBm, at 315Hz
–1.5
0.0
1.5
dB
For 4.5kHz, –53.8dBm, at 315Hz
–1.2
0.3
1.8
dB
70µs-NORM frequency F70-N
F120-H
For 5.3kHz, –52.5dBm, at 315Hz
0.7
2.2
3.7
dB
70µs-HIGH frequency
F70-H
For 9.1kHz, –47.8dBm, at 315Hz
1.1
2.6
4.1
dB
Signal handling
SH
RL = 2.7kΩ, 1kHz, THD = 1%
–10.0
–3.0
—
dBm
Total harmonic distortion
THD
RL = 2.7kΩ, 1kHz, –52dBm
—
0.19
0.5
%
S/N ratio
(120µs-NORM)
SN (A-WTG) Rg = 2.2kΩ, “A”-WTG filter
55.0
60.0
—
dB
Output offset voltage
VOFF
2.2
2.5
2.8
V
DC feedback resistance
RFB
150
210
270
kΩ
Input bias resistance
RIN
—
0.3
1.0
µA
MIX output voltage
V-MIX
–1.5
0.0
1.5
dB
Ripple filter output
current
RFIO
10.0
—
—
mA
Control voltage “High”
level
VCH
Threshold voltage of mode
control pin
2.5
—
VCC
V
Control voltage “Low”
level
VCL
Threshold voltage of mode
control pin
GND
—
1.0
V
Playback equalizer amplifier
120µs-HIGH frequency
120µs-NORM, Rg = 100kΩ
120µs-NORM, 2.7kHz, –52dBm
∗ NORM-NORM = NORMAL Tape, NORMAL Speed
CrO2-NORM = CrO2 Tape, NORMAL Speed
NORM-HIGH = NORMAL Tape, HIGH Speed
CrO2-HIGH = CrO2 Tape, HIGH Speed
METAL-HIGH = METAL Tape, HIGH Speed
120µs-HIGH = EQ: 120µs, HIGH Speed
70µs-HIGH = EQ: 70µs, HIGH Speed
METAL-NORM = METAL Tape, NORMAL Speed
120µs-NORM = EQ: 120µs, NORMAL Speed
70µs-NORM = EQ: 70µs, NORMAL Speed
–7–
GND
Power
Supply
S1
S3
1
S5
R10 680kR8 100k
C1 4.7µ/25V
2
PB IN2
(L)
C3 4.7µ/25V
S7
C5
100µ
25V
R14
180
C7
0.015µ
C11
4.7µ
25V
S9
S11
4
PB FB1
(L)
C9
4.7µ
25V
6
5
PB FB2
(L)
3
I REF
7
CXA1498S/M
SPEED
R25 1k
S13
TAPE
SPEED
8
C13 1µ/25V
S15
DECK
B EQ
9
METAL
10
S17
METAL
11
12
S19
13
S21
C25
2.2µ
25V
S35
S31
S30
S29
S28
S27
S25
R47
2.7k
R51
100
S32
S33
R52 S34
100
R48
2.7k
S26
R41 R49 R42 R50
10k 100 10k 100
S23
R43
10k
C28
4.7µ
25V
15
14
16
17
18
19
20
21
22
C29
4.7µ
25V
23
C26
2.2µ
25V
R44
10k
24
PB OUT
(L)
R12 2.2k
PB IN1
(L)
R6 680k
MS OUT
R17 2.7k
GND
S24
25
R27 1k
DECK-B
EQ
C15 1µ/25V
R1
620
S22
26
R30 1k
Audio
SG
S20
27
C10
4.7µ
25V
S12
C17 1µ/25V
S39
S37
S36
R45 R53 R46
10k 100 10k S40
28
R15
180
C8
0.015µ
S10
R32
1.1k
29
C6
100µ
25V
S18
REC
MUTE
PB IN1
(R)
S8
S16
DECK
A EQ
PB IN2
(R)
R7 680k
PB FB1
(R)
30
C2 4.7µ/25V
PB FB2
(R)
R34 300k
DC
A
Ammeter
C4 4.7µ/25V
PB OUT
(R)
R13 2.2k
RFS
R9 100k R11 680k
S6
R18 2.7k
S4
R24 10k
RFC
R20 2.7k
DECK
A/B
R35 10k C21 10µ/25V
AGC
TC
C20 10µ/25V
AGC
(L)
C23 4.7µ/25V
REC IN
(L)
R37 62k
S2
C12 100µ/25V
DECK-A
EQ
R26 1k
DC 5V
Supply
R21 470
S14
DECK
A/B
C14 1µ/25V
REC
MUTE
R28 1k
R19 R22
2.4k 2.4k
C16 1µ/25V
R16
5.6k
C18 1µ/25V
VG
C19 47µ/25V
AGC
(R)
R31 1k
R33
6.2k
R36 10k
R29
3k
C22 10µ/25V
REC IN
(R)
R38 62k
VCC
R23 27k
R3 2.2k
R2 2.2k
R40 5.1k
REC OUT REC OUT
(R)
(L)
GND
–8–
R39 5.1k
R5 100k
R4 100k
C27 100µ/25V
Electrical Characteristics Test Circuit
0dB or
30dB
S45
Oscillo
-scope
Distortion
Analyzer
AC
Voltmeter
S41
Noise Filter
1kHz BPF
DIN Audio
"A" WTG
GND
R54
50k
Amp
DC
Voltmeter
S42
S43
S44
CXA1498S/M
C4
0.015µ
PB Only
HEAD
(DECK-A)
1
PB IN2
GND
PB IN1
2
C1
100µ
C3
0.015µ
100k
PB FB2
GND
R1
180
3
210k
DECK- B PB
DECK- A
DECK- A
DECK- B PB
PB FB1
DECK
A/B
DECK
A/B
210k
4
27
30
28
29
PB IN1 PB IN2 PB FB1 PB FB2
100k
R2
180
C5
4.7µ
PB
OUT
5
26
PB
OUT
C7
4.7µ
MS
OUT
RFS
6
25
7
SPEED
8
DECK
-B EQ
GND
9
GND
AGC
TC
VGS
MUTE
CONT
METAL
10
REC EQ
CONTROL
PB EQ
CONTROL
20
11
30k
VG
C16
47µ
GND
AGC
GND GND
C19
10µ
13
R16
5.6k
VCC
16
REC
OUT
GND
C21
2.2µ
GND
14
GND
GND
GND
REC
OUT
15
REC EQ
REC EQ
VCC
17
VCC
C22
2.2µ
R18 22k
REC
IN
R14
22k
12
GND
R19 22k
R17
5.6k
18
REC
IN
AGC DET
19
AGC
30k
C20
10µ
R15
22k
from Dolby NR IC
Dolby NR IC
(RECOUT)
C26
2.2µ
C27
2.2µ
C30
150p
L1
12mH
C32
180p
REC
REC
GND
REC/PB
GND PB
R20
10k
C28
820p
Bias
OSC
L2
12mH
C29 C33
820p 180p
R21
10k
C31
150p
GND PB
REC/PB
GND
REC/PB
HEAD
(DECK-B)
REC/PB
HEAD
(DECK-B)
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 GND
R3
27k
I REF
C8 100µ
GND
REC MUTE
23
21
22
REC
DECK
DECK
MUTE
A/B
-A EQ
BIAS &
I REF
24
R4 10k
RFC
C10 4.7µ
C9 4.7µ
C6
4.7µ
R5 10k
C2
100µ
C11 4.7µ
PB Only
HEAD
(DECK-A)
R6 10k
GND
C12 4.7µ
GND
DECK A/B
SPEED
VCC
R8 10k
R7 10k
GND
C14 4.7µ
C13 4.7µ
GND
DECK-A EQ
DECK-B EQ
Filter OUT
to AMS
R10 10k
R9 10k
GND
C17 4.7µ
to Dolby NR IC
Dolby NR IC (PB IN)
to Dolby NR IC
Dolby NR IC (PB IN)
C15 47µ
METAL
(METAL/METAL)
R11 1M
C18 4.7µ
to Dolby NR IC
Dolby NR IC (REC IN)
R13 10k
LINE IN
LINE IN
R12 10k
to Dolby NR IC
Dolby NR IC (RECIN)
C24 0.47µ
C23 0.47µ
–9–
from Dolby NR IC
Dolby NR IC
(REC OUT)
C25 100µ
Application Circuit
CXA1498S/M
CXA1498S/M
Notes on Operation
(1) Operation mode control (each mode of recording and playback equalizers)
1: Playback equalizer switching (120µs/70µs)
(Pins 9, 22 and 23)
DECK B-EQ (Pin 9)
DECK A-EQ (Pin 22)
DECK A/B
(Pin 23)
L
H
L
H
120µs (A-DECK)
70µs (A-DECK)
Follows B-EQ control.
L
H
Follows A-EQ control.
120µs (B-DECK)
70µs (B-DECK)
2: Normal/double speed switching
(Pin 8)
Both playback and recording equalizers are switched in normal/double speed switching.
∗ For double speed, both playback and
L
H
SPEED Pin 8
recording systems are switched to
Playback EQ
Normal speed
Double speed
double speed characteristics of each
Recording EQ
Normal speed
Double speed
setting mode:
(PB-EQ: 120µs, 70µs)
(REC-EQ: NORMAL, CrO2, METAL)
3: Recording equalizer switching (NORMAL, CrO2, METAL)
(Pins 9 and 10)
METAL (Pin 10)
DECK B-EQ
(Pin 9)
L
H
L
NORMAL (Type-I)
METAL (Type-IV)
H
CrO2 (Type-II)
METAL (Type-IV)
(2) Recording mute (REC MUTE: ON/OFF)
(Pin 21)
The recording mute function of the CXA1498S is controlled by a recording mute circuit to vary the electric
volume for recording equalizer amplifier gain by applying the DC voltage to REC MUTE (Pin 21).
REC MUTE
Recording mute ON
Attenuation –6dB
Recording mute OFF
Control voltage
GND ≤ VCL ≤ 0.5V
2.0V
3.5V ≤ VCH ≤ VCC
– 10 –
CXA1498S/M
Recording equalizer vs. Frequency characteristics (Normal speed)
25
0dB = NORM-NS mode
315Hz, –25dBm at Rec Out
Response [dB]
20
15
10
METAL-NS
5
CrO2-NS
0
NORM-NS
–5
0.125
1.0
10
50
FREQ [kHz]
Recording equalizer vs. Frequency characteristics (Double speed)
25
0dB = NORM-NS mode
315Hz, –25dBm at Rec Out
Response [dB]
20
15
10
METAL-HS
5
CrO2-HS
0
NORM-HS
–5
0.125
1.0
10
50
FREQ [kHz]
Playback equalizer vs. Frequency characteristics
Gain [dB]
60
120µs-NS
120µs-HS
70µs-NS
70µs-HS
5
dB/
20
0.050 0.1
1.0
FREQ [kHz]
– 11 –
10
20
CXA1498S/M
AGC output voltage characteristics
–10
AGC OFF
–20
–25
AGC ON
–30
–35
–35
–30
–25
–20
–15
–10
–5
0
Input level [dBm]
AGC total harmonic distortion
1.0
T. H. D + N [%]
Output level [dBm]
–15
0.1
0.01
–35 –30 –25 –20 –15 –10
–5
Input level [dBm]
– 12 –
0
5
5
CXA1498S/M
Package Outline
Unit: mm
CXA1498S
+ 0.1
05
0.25 – 0.
30PIN SDIP (PLASTIC) 400mil
+ 0.4
26.9 – 0.1
10.16
+ 0.3
8.5 – 0.1
16
30
0° to 15°
15
1
+ 0.4
3.7 – 0.1
3.0 MIN
0.5 MIN
1.778
0.5 ± 0.1
0.9 ± 0.15
PACKAGE STRUCTURE
EPOXY / PHENOL RESIN
MOLDING COMPOUND
SONY CODE
SDIP-30P-01
LEAD TREATMENT
SOLDER PLATING
EIAJ CODE
SDIP030-P-0400-A
LEAD MATERIAL
COPPER ALLOY
PACKAGE WEIGHT
1.8g
JEDEC CODE
CXA1498M
30PIN SOP (PLASTIC) 375mil
+ 0.4
18.8 – 0.1
30
+ 0.4
2.3 – 0.05
16
1
0.1 ± 0.1
9.3
15
1.27
0.45 ± 0.1
A
0.5 ± 0.2
10.3 ± 0.4
+ 0.3
7.6 – 0.1
0.10
+ 0.1
0.2 – 0.05
0° to 10°
DETAIL A
± 0.12 M
PACKAGE STRUCTURE
PACKAGE MATERIAL
EPOXY RESIN
SONY CODE
SOP-30P-L03
LEAD TREATMENT
SOLDER PLATING
EIAJ CODE
∗SOP030-P-0375-C
LEAD MATERIAL
COPPER / 42 ALLOY
PACKAGE WEIGHT
0.7g
JEDEC CODE
– 13 –