tsa5515t NXP Semiconductors, tsa5515t Datasheet - Page 6

• Manufacturer Part Number: tsa5515t
• Description: 1.3 Ghz Bi-directional I2c-bus Controlled Synthesizer
• Manufacturer: NXP Semiconductors

After the address transmission (first byte), data bytes can
be sent to the device. Four data bytes are needed to fully
program the TSA5515T. The bus transceiver has an
auto-increment facility, which permits the programming of
the TSA5515T within one single transmission
(address + 4 data bytes).
The TSA5515T can also be partly programmed on the
condition that the first data byte following the address is
Philips Semiconductors
FUNCTIONAL DESCRIPTION
The TSA5515T is controlled via the two-wire I
programming, there is one module address (7 bits) and the
R/W bit for selecting READ or WRITE mode.
WRITE mode:
R/W = 0 (see Table 1)
Table 1
MA1, MA0 programmable address bits (see Table 3)
Note
1. X = don’t care
November 1991
Address
Programmable
divider
Programmable
divider
Charge-pump
and test bits
Output ports control
bits
A
N14 to N0
N = N14 2
CP
CP = 0
CP = 1
P7, P2, P1 = 1
P7, P2, P1 = 0
T1, T0, OS = 0 0 0
T1 = 1, P2 = f
T0 = 1
OS = 1
1.3 GHz bi-directional I
Write data format
14
+N13 2
ref
, P7 = f
13
DIV
MSB
N7
P7
+...+N1 2
1
0
1
N14
CP
N6
X
1
1
2
+N0
C-bus controlled synthesizer
N13
N5
T1
X
0
acknowledge bit
programmable divider bits
charge-pump current
50 A
220 A
open-collector outputs are active
outputs are in high impedance state
normal operation
operational amplifier output is switched off (varicap drive disable)
2
3-state charge-pump
C-bus. For
N12
N4
T0
X
0
6
N11
N3
byte 2 or byte 4. The meaning of the bits in the data bytes
is given in Table 1. The first bit of the first data byte
transmitted indicates whether frequency data (first bit = 0)
or charge pump and port information (first bit = 1) will
follow. Until an I
controller, additional data bytes can be entered without the
need to re-address the device. This allows a smooth
frequency sweep for fine tuning. At power-on, the ports are
set to the high impedance state.
The 7.8125 kHz reference frequency is obtained by
dividing the output of the 4 MHz crystal oscillator by 512.
Because the input of the UHF/VHF signal is first divided by
8, the step size is 62.5 kHz. A 3.2 MHz crystal can offer a
step size of 50 kHz.
X
X
0
MA1
N10
N2
P2
X
MA0
2
N9
N1
P1
C-bus STOP condition is sent by the
X
LSB
OS
N8
N0
X
0
A
A
A
A
A
Product specification
TSA5515T
byte 1
byte 2
byte 3
byte 4
byte 5