Kenwood TS-990S Service Manual

TS-990S
67
SEMICONDUCTOR DATA
Pin No. Name I/O Function
10 GND - GND
11 LE I Latch enable
12 DC18SW O
Switch signal for digital 1.8V DC/DC
converter
H: Active
13 D4 I Data bit 4
14 D5 I Data bit 5
15 33SW1 O
Switch signal for digital 3.3V FET
H: Active
16 33SW2 O
Switch signal for digital 3.3V FET
H: Active
17 D6 I Data bit 6
18 D7 I Data bit 7
19 REFO O
Reference output select
H: Reference output
20 VCC - 3.3V
Extension Port IC: TC74VHC373FT
(Control unit IC42)
Pin No. Name I/O Function
1 OE I Output enable
2 SDEN1 O DDS1 enable for sub local unit
3 D0 I Data bit 0
4 D1 I Data bit 1
5 SDIO O DDS1 I/O_update for sub local unit
6 SDEN2 O DDS2 enable for sub local unit
7 D2 I Data bit 2
8 D3 I Data bit 3
9 SDEN3 O DDS3 enable for sub local unit
10 GND - GND
11 LE I Latch enable
12 SPEN1 O PLL1 enable for sub local unit
13 D4 I Data bit 4
14 D5 I Data bit 5
15 SPEN2 O PLL2 enable for sub local unit
16 SPEN3 O PLL3 enable for sub local unit
17 D6 I Data bit 6
18 D7 I Data bit 7
19 SLSEN O Sub local shift register enable
20 VCC - 3.3V
Extension Port IC: TC74VHC373FT
(Control unit IC43)
Pin No. Name I/O Function
1 OE I Output enable
2 NC O No connection
Pin No. Name I/O Function
3 D0 I Data bit 0
4 D1 I Data bit 1
5 NC O No connection
6 NC O No connection
7 D2 I Data bit 2
8 D3 I Data bit 3
9 NC O No connection
10 GND - GND
11 LE I Latch enable
12 NC O No connection
13 D4 I Data bit 4
14 D5 I Data bit 5
15 NC O No connection
16 NC O No connection
17 D6 I Data bit 6
18 D7 I Data bit 7
19 NC O No connection
20 VCC - 3.3V
DSP-Sub MCU: F2136ACNFKEVA
(DSP unit IC101)
Pin No. Name I/O Function
1 NC O No connection
2 VREF I A/D standard voltage input
3 DMODE I Flash programming mode signal
4 NC O No connection
5 MDHLT I TXMRX-DSP check signal input
6 DRESET I
For reset
L: Reset
7 XOUT O System clock output (18.432MHz)
8 VSS - GND
9 XIN I System clock input (18.432MHz)
10 VCC I Power supply input (3.3V)
11 SDHLT I SRX-DSP check signal input
12 NC O No connection
13 MDRES O
TXMRX-DSP reset
L: Reset
14 SDRES O
SRX-DSP reset
L: Reset
15 NC O No connection
16 DSOUT O DSP data output (SPI)
17 DCLK O DSP dlock output (SPI)
18 DSIN I DSP data input (SPI)
19 NC O No connection
20 MDSCS O
TXMRX-DSP chip select
L: Enable

Kenwood TS-990S Specifications

General

Receiver Type	Triple Conversion Superheterodyne
Antenna Tuner	Built-in automatic antenna tuner
DSP	Yes
IF DSP	Yes
Modes	SSB, CW, AM, FM
Display	7-inch TFT color LCD
Weight	25 kg (55.1 lbs)
Antenna Connectors	SO-239
Power Supply	13.8V DC