參數(shù)資料
型號: MAX2369EGM
廠商: Electronic Theatre Controls, Inc.
英文描述: PLASTIC ENCAPSULATED DEVICES
中文描述: 塑封器件
文件頁數(shù): 8/16頁
文件大?。?/td> 237K
代理商: MAX2369EGM
M
Complete Dual-Band
Quadrature Transmitter
8
_______________________________________________________________________________________
Pin Description (continued)
PIN
FUNCTION
23, 24
Differential Q-Channel Baseband Inputs to the Modulator. These pins go directly to the bases of
a differential pair and require an external common-mode bias voltage.
22
Supply for the I/Q Modulator. Bypass with capacitor as close to the pin as possible. The bypass
capacitor must not share its ground vias with any other branches.
30, 31
Differential Tank Pins for the IF VCO. These pins are internally biased to +1.6V.
29
Buffered LO Output. Control the output buffer using register bit BUF_EN and the divide ratio
using the register bit BUF_DIV.
28
Supply Pin to the VCO Section. Bypass as close to the pin as possible. The bypass capacitor
should not share its vias with any other branches.
27
Shutdown Input. A logic low on
SHDN
shuts down the entire IC. An R-C lowpass filter may be
used to reduce digital noise.
25, 26
Differential I-Channel Baseband Inputs to the Modulator. These pins go directly to the bases of
a differential pair and require an external common-mode bias voltage.
NAME
Q+, Q-
V
CC
TANK-,
TANK+
IFLO
V
CC
SHDN
I+, I-
GND
DC and AC GND Return for the IC. Connect to PC board ground plane using multiple vias.
Exposed
paddle
GND
V
CC
LOH
LOL
REF
V
CC
IFCP
V
CC
Ground. Connect to PC board ground plane.
40, 45, 46,
47, 48
Supply Pin. Bypass as close to the pin as possible. The bypass capacitor may share with sup-
ply pin for digital circuitry, pin 39.
41
High-band RF LO Input Port. AC-couple to this port.
43
Low-band RF LO Input Port. AC-couple to this port.
44
Reference Frequency Input. REF is internally biased to V
CC
- 0.7V and must be AC-coupled to
the reference source. This is a high-impedance port (25k
II
3pF).
36
Supply for the IF Charge Pump. This supply can differ from the system V
CC
. Bypass as close to
the pin as possible. The bypass capacitor must not share its vias with any other branches.
37
High-Impedance Output of the IF Charge Pump. Connect to the tune input of the IF VCOs
through the IF PLL loop filter. Keep the line from IFCP to the tune input as short as possible to
prevent spurious pickup, and connect the loop filter as close to the tune input as possible.
38
Supply Pin for Digital Circuitry. Bypass as close to the pin as possible. The bypass capacitor
must not share its vias with any other branch.
39
32, 33, 34,
35, 42
No Connection. Leave these pins floating.
N.C.
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