SGS Thomson Microelectronics STV5712 Datasheet
AND RECORD AMPLIFIER FOR VCR
PLAY-BACK MODE
.
LOW NOISE 68dB AMPLIFIERS FOR
2 HEADS
.
AUTOMATIC OFFSET CANCELLATION
BETWEENTHE 2 SELECTEDHEADS
.
ONE PLAY-BACKOUTPUT
.
MODESELECTIONBY LOGIC INPUT
RECORDMODE
.
ONE INTEGRATED I/I CONVERTER WITH
ACCURATE CONTROL OF TRANSCONDUCTANCE
.
RECORD AMPLIFIER WITH AUTOMATIC
PROTECTION AGAINST SHORTCIRCUIT
.
5V SUPPLYVOLTAGE
STV5712
ADVANCEDFM AUDIO PLAY-BACK
SO16 NARROW
(Plastic Micropackage)
ORDER CODE :STV5712
DESCRIPTION
The STV5712 is an advancedtwo head FM audio
recordand play-backamplifier for VCR.
PIN CONNECTIONS
1
2
3
4
5
6
7
8
April 1996
V
CC
V2
C2
H2
GND1
H1
C1
FM OUT
16
15
14
13
12
11
10
V1
I
OUT
GND2
PROT
V
MES
V
IN
SW REC
9
SW H
5712-01.EPS
1/8
STV5712
BLOCK DIAGRAM
OUT
V1
I
GND2
16
1
CC
V
14
15
234
V2
13
C2
FUNCTIONAL DESCRIPTION
STV5712 is intended for 2 heads FM audio VCR
applications.
Highperformancetechnologyallowsverylownoise
levels (current and voltage). In play-backmode a
special feature suppresses the DC offset when
switching two channels.Optimized play-backoutput stagegives to the STV5712largecapability to
directly drive a coaxial cable in order to reduce
number of externalcomponents.
Only onepower supplyis necessaryfor play-back
and record modes. The mode can be chosen
throughalogic input.Aspecialcarehasbeentaken
to avoid current peaks through the rotary transformers.
MESVIN
PROT
12
V
11
SW REC
SW H
910
S
T
V
5
7
1
2
5
6
78
H2
GND1
H1
C1
FM OUT
Duringplay-back mode,recordoutput is grounded
via an internaltransistor and during record mode
preamplifiersare turnedoff.
There is one output currentfor the two heads,the
DC current and the AC characteristicscanbe very
precisely controled with accurate external resistors.If recommendedresistancesare used,a±5%
transconductanceaccuracy is guaranted.
The recording amplifier includes a protectionsystemwhichprotectstheICand theapplicationboard
against overheatingin case of short circuit on the
recording transconductancecomponents.
STV5712is fullyprotected against ESD.
5712-02.EPS
ABSOLUTEMAXIMUMRATINGS
Symbol Parameter Value Unit
V
CC
T
J
Power Supply Voltage 6 V
Junction Temperature + 150
THERMALDATA
Symbol Parameter Value Unit
Junction-ambient ThermalResistance Typ. 100
2/8
R
th (j-a)
o
C/W
o
C
5712-01.TBL
5712-02.TBL
STV5712
ELECTRICAL OPERATINGCHARACTERISTICS (TA=25oC unlessotherwisespecified)
Power Consumption
Parameter
= 5V 25mA 35mA 60mA 80mA
V
CC
Note : 1. R1 = 5.6Ω
Play-back Mode
=5V, no load on Pin V
V
CC
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
V
CC1
Supply Current 25 35 mA
Supply Voltage 4.75 5 5.25 V
CC
FM OUT
G
∆G
Pre-amplification Gain Sinus wave 1.6MHz
PB
Gain Difference of Output Signalon
PB
Pin FM OUT between Channel 1
and Channel 2
e
Equivalent Input VoltageNoise
N
Level
i
Equivalent Input Current Noise Pins H1, H2 3.6 5.0 pA ⁄√Hz
N
CRT Crosstalk Sinus wave 1.6MHz
Bandwidth Cut-off Frequency -3dB attenuation 50Ω in parallel on
F
LCPB
F
HCPB
Input Capacitance Pins H1, H2 45 pF
IN
Pre-amplifier Input Resistance Pins
IN
H1, H2
Output Impedance DC 30 50 Ω
PB
DC Level at Pin FMOUT 1.8 2.4 3 V
Head SwitchOffset 150 mV
DC
Second Harmonic Sinus wave 1.6MHz
PB1
V
∆V
SH
C
R
Z
DCPB
OUT
400mV
Input on Pin H1 or H2
on output,
PP
Sinus wave 1.6MHz
0.1mV
on inputs H1 or H2
PP
Input grounded via switching
transistor on Pins H1, H2
100µV
, All switches combinated
PP
the input
At 1.6MHz 600 Ω
100µV
on input 500Ω//100pF
PP
Play-Back Record (1)
Typ. Max. Typ. Max.
63 68 73 dB
1.2 dB
0.34 0.5 nV⁄√Hz
-45 -40 dB
Low
0.1 MHz
High 8
-45 -40 dB
5712-03.TBL
MHz
5712-04.TBL
3/8
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