Aiwa SX-DV1, Service Manual

Page: 35 / 88

Pin No. Pin Name I/O Description
-35-
IC DESCRIPTION -3/3 (IC,TC2000/IC,TA2025 -1/1)
1 BIASCAP -
Bandgap reference times two (typically 2.5VDC). Used to set the common mode voltage for the
input op amps. This pin is not capable of driving external circuitry.
2 FDBKP2 O Positive switching feedback.
3 DCMP - Internal mode selection. This pin must be grounded for proper device operation.
4 FDBKN2 0 Negative switching feedback.
5 VPWR - Test pin. Must be left floating.
6 FDBKP1 I Positive switching feedback.
7 FDBKN1 I Negative switching feedback.
8 HMUTE O
Logic output. A logic high indicates both amplifiers are muted, due to the mute pin state, or a
“fault”.
9 Y1 O Non-inverted switching modulator outputs.
10 Y1B O Inverted switching modulator outputs.
11 Y2B O Inverted switching modulator outputs.
12 Y2 O Non-inverted switching modulator outputs.
13 NC - No connect
14 OCD2 - Over Current Detect.
15 REF - Internal reference voltage; approximately 1.2 VDC.
16 OCD1 - Over Current Detect. This pin must be grounded for proper device operation.
17 VnnSense - Negative power stage over/under supply voltage sense resistor tie point.
18 OVRLDB - A logic low output indicates the input signal has overloaded the amplifier.
19 VppSense - Positive power stage over/under supply voltage sense resistor tie point.
20 AGND - Ground
21 V5 I 5 Volt power supply input.
22 OAout1 O Input stage output pins.
23 INv1 I
Single-ended inputs. Inputs are a ÅgvirtualÅh ground of an inverting opamp with approximately
2.4VDC bias.
24 MUTE I
When set to logic high, both amplifiers are muted and in idle mode. When low (grounded),both
amplifiers are fully operational. If left floating, the device stays in the mute mode.Ground if not
used.
25 BBM0 - Break-before-make timing control to prevent shoot-through in the output FETs.
26 BBM1 - Break-before-make timing control to prevent shoot-through in the output FETs.
27 OAout2 I Input stage output pins.
XA-DV1
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