ML2713 Просмотр технического описания (PDF) - Micro Linear Corporation
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ML2713 Datasheet PDF : 18 Pages
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PRELIMINARY
OPERATIONAL MODES (CONTINUED)
ML2713
Transmit Output Buffer
The transmit output buffer is a limiting amplifier. Its
nominal output power at 260MHz is -12dBm, driving
a 340W differential load.
On IC Transmit Regulator
100000
10000
which is enabled and disabled with the transmit circuits.
The regulator powers external circuits such as a transmit
VCO. The noise floor of the ML2713 is shown in the
Figure 3. The regulator minimizes noise output above
5KHz to avoid introducing phase noise into the VCO.
The transmitter circuits in the ML2713 are shown in Figure
4.
1000
100
10
100
1000 10000 100000 1000000 10000000
Frequency (Hz)
Figure 3. Transmit Regulator Noise Floor
1IF 26
1IFB 27
RSSI
BPI BPIB BPO BPOB
DPSB DPS
DISCO DFI1
DFO1 DFI2
17
19 20 30 29
34 35
38 40
41
42
RSSI
Receive Image Reject
Down-Convert Mixer
Rx I/P
Amplifier
0/90
Limiter
VARIABLE
CAPACITOR
ARRAY
Limiter
0/90
Limiter
Discriminator
Unity Gain
Op Amp
LOWPASS
FILTER
Comparator
Unity Gain
Op Amp
43 DFO2
44 VDC
DC
REC
46 SLICE
VCC1 6
VCC1 7
VCC2 21
VCC2 24
VCC2 25
VCC3 10
VCC4 33
REG 32
Tx O/P
Amplifier
Transmit Image Reject
Up-Convert Mixer
0/90
VARIABLE
CAPACITOR
ARRAY
VARIABLE
CAPACITOR
ARRAY
7 -Bit
Up/Down
COUNTER
7
6 BIT
DAC
TX VCO
REGULATOR
0/90
FREQUENCY
DIVIDER
22 23
2LO 2LOB
9 16 18 28 39
GND GND GND GND GND
5 4 3 2 1 47
DD0 DD1 DD2 DD3 DD4 DD5
Figure 4. Circuits Active in Transmit Mode
Comparator
8 CMO
CONTROL
14 TS
15 LOE
13 RS
45 31 37
MS1 MS2 MS3
January, 2000 PRELIMINARY DATASHEET
11
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