SA1630 Datasheet, PDF (13/22 Pages) NXP Semiconductors – IF quadrature transceiver

Philips Semiconductors
IF quadrature transceiver
Product specification
SA1630
Table 2. Definition of SA1630 Serial Registers
First data word: (shown with default values)
Address SA1630
Sub
Adr
N-Divider
Reference
Divider
Charge-Pump
Test
MSB
LSB
a0 a1 a2 a3 sa n0 n1 n2 n3 n4 n5 n6 n7 n8 r0 r1 c0 c1 c2 x0 x1
111001011000001011100
Address: 4 bits, a0...a3, fixed to 1110
Sub:Address: 1 bit, sa, fixed to 0 for first data word
N-Divider:
9 bits, n0...n8, values 64 (00100 0000) to 511 (11111 1111) allowed for IF choice, default 352 (assuming LO
input frequency is 704 MHz).
Reference Divider Register: 2 bits, r0...r1, 00 = /8, 01 = 11, 10 = /22, 11 = /44. Default: 10
Charge-Pump Register: 3 bits, c0...c2, Binary setting factor for charge pumps, values 000 = minimum current to 111 = maximum
current, default is maximum charge pump current (111)
Test Register: 2 bits, x0...x1, default 00, see functional description for details
Second data word: (shown with default values)
Address SA1630
Sub
Adr
LLL Mode
Control
I Offset Register
Q Offset
Register
VGA Gain Control
Misc
Control
bits
MSB
LSB
a0 a1 a2 a3 sa s0 s1 i0 i1 i2 q0 q1 q2 b0 b1 b2 b3 b4 b5 bc vc
111010000000011111101
Address: 4 bits, a0...a3, fixed to 1110
Sub:Address: 1 bit, sa, fixed to 1 for second data word
LLL Mode control: 2 bits, s0, s1 Not used, always set to 0, 0
I Offset Register: 3 bits, i0...i2 .10 Not used, always set to 0, 0, 0
Q Offset Register: 3 bits, q0...q2. q0. Currently not being used, always set to 0, 0, 0
VGA Gain Control 6 bits, b0...b5. 000 000 corresponds to maximum gain and 111 111 to minimum gain in 2 dB increments.
Check control table contained elsewhere in this document.
VGA Control Enable 1 bit, bc. When bc=0 the VGA is controlled by external pins. When bc=1 then bits b0...b5 control the VGA.
Default bc=0, control by external pins
Regulator Disable 1 bit, Vc. When Vc=0 the 2.5V reference output is completely powered down. When Vc=1 the reference
voltage is enabled (provided Tx_ON=HIGH). Default: Vc = 1, enable the 2.5 reference.
1998 Jul 21
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