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參數(shù)資料
| 型號： | TO353 |
| 廠商： | Atmel Corp. |
| 英文描述： | 2.8 V Tri-band/ Quad-mode RF Receiver for CDMA/AMPS/ GPS |
| 中文描述： | 2.8 V三頻/四模式射頻接收器的CDMA / AMPS二元/全球定位系統(tǒng) |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 126K |
| 代理商： | TO353 |
4
T0353
4559AS–CDMA–10/02
Operation
The various operating modes are controlled by the logic inputs Band_SEL, Gain, LIN,
LO/2 and BUFFEN. Table 1 shows the pin settings for the various operating modes.
Table 1.
Mode Programming Truth Table (Continued)
Note:
1. The symbol X (“do not care”) means a logic input does not affect an operating mode.
15
16
17
18
19
20
21
22
23
24
CLO_OUT
GPSMix_IN
Vcc_LO_Tx
GPSMix_OUT-
GPSMix_OUT+
AMPS_OUT-
AMPS_OUT+
Vcc_Mix
CDMA_OUT-
CDMA_OUT+
Cellular LO buffer output. Internally matched to 100
GPS mixer input.
Supply voltage for LO buffers.
Negative GPS IF output.
Positive GPS IF output.
Negative AMPS IF output.
Positive AMPS IF output.
Supply voltage for all mixers.
Negative CDMA IF output.
Positive CDMA IF output.
LO output buffer enable. Set BUFFEN pin HIGH to power up the LO buffer output corresponding to
the selected band.
Cell RF input to Cell CDMA mixer and Cell AMPS mixer.
PCS mixer RF input.
Supply voltage for logic control circuits.
Logic input for band select. Logic LOW selects PCS or GPS. Logic HIGH selects cellular (AMPS).
Logic input for high or low linearity. Logic HIGH selects High linearity.
PCS LNA output. Requires a pull-up inductor to V
CC
and a series blocking capacitor, which can be
used as part of the output matching network.
Bias resistor for PCS LNA. For typical bias use a 560
current for HGHL mode.
Device ground and heat sink, requires good thermal path; RF reference plane.
. Does not require a blocking capacitor.
25
BUFFEN
26
27
28
29
30
CM_IN
PM_IN
Vcc_DIG
Band_SEL
LIN
31
PLNA_OUT
32
Iset_PCS
resistor to ground which sets the bias
–
Paddle
Pin Description (Continued)
Pin
Symbol
Function
Mode
Shut down
PCS mode
Condition
All circuits off
High-gain, high-linearity
High-gain, low-linearity
Activate PCS LO output buffer
High-gain, high-linearity
High-gain, low-linearity
Low-gain
AMPS mode
LO/2 On
Activate Cell LO output buffer
Logic Inputs
(1)
LIN
Low
High
Low
Band SEL
Low
Low
Low
Low
High
High
High
High
High
High
Low
Gain
Low
High
High
X
High
High
Low
Low
X
X
Low
LO/2
X
X
X
X
X
X
X
X
High
X
X
BUFFEN
X
X
X
High
X
X
X
X
X
High
X
X
Cellular mode
High
Low
High
Low
X
X
High
GPS mode
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