No. 5288-4/7

LA7337

[Record/playback mode settings]

Pin 16 = low

→ record mode

Pin 16 = high

→ playback mode

[Bell filter offset adjustment]

[Test mode settings]

The IC enters test mode if pin 6 is set to 5 V. The pin 5, 11, 17, and 26 outputs behave as follows in this mode.

Pin 5: The 4.43-MHz VCO output appears (However, note that a load of about 1 k

Ω is required between this pin and

Pin 11: The 1.1-MHz band-pass filter output appears.

Pin 17: The 4.3-MHz band-pass filter output appears.

Pin 26: The BGP (used for SECAM discrimination, playback AGC, and record killer) can be monitored.

Standard Input Signal Levels

Continued from preceding page.

Parameter

Symbol

Conditions

Ratings

Unit

min

typ

max

Playback mode phase detector output

V5 = V6 = 0 V, SW8B = on, V16 = 5 V,

difference voltage (1)

S27 = composite sync., S13 = sine wave

150

180

mV

(50 mVp-p, f = 1.0625/1.1016 MHz)

Playback mode phase detector output

As above, except S13 = sine wave

100

mV

difference voltage (2)

(50 mVp-p, f = 627 kHz)

Playback mode SECAM discriminator

V16 = 5 V, SW23 = SW24 = On

4.5

V

characteristics (1)

Playback mode SECAM discriminator

V16 = 5 V, SW23 = SW24 = On

0.5

V

characteristics (2)

SECAM discriminator comparator

3.2

3.5

3.8

V

threshold voltage

Record/playback control threshold voltage

2.3

2.5

2.7

V

V16 = 0 V, SW25 = on, V25 = 3 V,

Forced SECAM mode threshold voltage

S27 = composite sync., S15 = sine wave

4

V

(200 mVp-p, f = 4.286 MHz)

V16 = 0 V, SW25 = on, V25 = 4 V,

Forced mute mode threshold voltage

S27 = composite sync., S15 = sine wave

1

V

(200 mVp-p, f = 4.286 MHz)

Reference voltage

4.1

4.3

4.5

V

REC-IN (pin 15)

The 200 mVp-p ID component

PB-IN (pin 13)

50 mVp-p

Internal filter group delay times (reference values)

1.1 MHz BPF

460 ns (PB) 430 ns (REC)

2.2 MHz BPF

180 ns

4.3 MHz BPFA

230 ns

4.3 MHz BPFB

170 ns

[Muting control table]

Voltage applied to pin 1

Output signal mode (pins 17 and 11)

4 V or higher

Forced SECAM

Open

AUTO (Uses the output of the internal discriminator)

1 V or lower

Forced mute mode