GS1531 Data Sheet
30573 - 7 February 2008 6 of 50
1.2 Pin Descriptions
Table 1-1: Pin Descriptions
Pin
Number
Name Timing Type Description
A1 LF Analog Output Control voltage to external voltage controlled oscillator. Nominally +1.25V
DC.
A2 VCO_VCC – Output
Power
Power supply for the external voltage controlled oscillator. Connect to pin
7 of the GO1555/GO1525*. This pin is an output.
Should be isolated from all other power supplies.
*For new designs use GO1555
A3 VCO_GND – Output
Power
Ground reference for the external voltage controlled oscillator. Connect to
pins 2, 4, 6, and 8 of the GO1555/GO1525*. This pin is an output.
Should be isolated from all other grounds.
*For new designs use GO1555
A4, A5 VCO
, VCO Analog Input Differential inputs for the external VCO reference signal. For single ended
devices such as the GO1555/GO1525*, VCO
should be AC coupled to
VCO_GND.
VCO is nominally 1.485GHz.
*For new designs use GO1555
A6, B5,
B6, C1,
C4, C5,
C6, C7,
C8, D1,
D2, D3,
D4, D7,
D8, E1,
E2, E3,
E7, F2,
F3, F7,
G1, G2,
G3, G7,
H1, H2,
H3, H7,
J1, J2,
J3, J4
NC – – No connect.
A7 PCLK – Input PARALLEL DATA BUS CLOCK
Signal levels are LVCMOS/LVTTL compatible.
HD 20-bit mode PCLK = 74.25MHz or 74.25/1.001MHz
HD 10-bit mode PCLK = 148.5MHz or 148.5/1.001MHz
SD 20-bit mode PCLK = 13.5MHz
SD 10-bit mode PCLK = 27MHz
A8, E8, K8 IO_VDD – Power Power supply connection for digital I/O buffers. Connect to +3.3V DC
digital.
