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参数资料
| 型号： | MAX2370ETM+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC TRANSMITTER QUAD 48TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 43 |
| 频率： | 450MHz |
| 调制或协议： | CDMA2000 |
| 功率 - 输出： | 10dBm |
| 电流 - 传输： | 134mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 2.7V ~ 3.3V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 包装： | 管件 |
Complete 450MHz Quadrature Transmitter
Pin Description (continued)
PIN
13, 14, 15
NAME
CLK, DI, CS
FUNCTION
CMOS Inputs from the 3-Wire Serial Bus (SPI/QSPI/MICROWIRE Compatible). A small RC
lowpass filter on each of these pins can be used to reduce noise on these lines.
Differential IF Outputs. This port is active when IF_SEL is LOW and supports both FM and CDMA
modes. IFOUT+ and IFOUT- must be inductively pulled up to V CC and differentially loaded with
typically 560 ? . A 400 ? differential IF bandpass filter is connected between this port and IFIN+/-.
18, 19
IFOUT-, IFOUT+ The pullup inductors can be part of the filter structure. The differential output impedance of this
port is nominally 400 ? , including the 560 ? external differential resistor. Keep the transmission
lines from these pins as short as possible to minimize the unintentional pickup of spurious signals
and noise.
RF and IF Gain-Control Analog Input. Accepts input voltages from 0.5V (minimum gain) to 2.5V
20
21
22
23, 24
25, 26
27
28
29
30, 31
36
37
38
39
GC
V CC
V CC
Q+, Q-
I+, I-
SHDN
V CC
IFLO
TANK-, TANK+
REF
V CCIFCP
IFCP
V CC
(maximum gain). When not driven, GC is internally biased to typically 1.5V. RC lowpass filter the
voltage applied to this pin to remove DAC noise or PDM clock spurs.
Power Supply for the IF VGA. Bypass to PC board ground with a 0.1μF capacitor placed as close
to the pin as possible. Do not share capacitor ground vias with other ground connections.
Power Supply for the I/Q Modulator. Bypass to PC board ground with a 0.1μF capacitor placed as
close to the pin as possible. Do not share capacitor ground vias with other ground connections.
Differential Q-Channel Baseband Inputs to the Modulator. Q+ and Q- connect directly to the
bases of a differential pair and require a typical 1.35V to (V CC - 1.5V) external common-mode bias
voltage.
Differential I-Channel Baseband Inputs to the Modulator. I+ and I- connect directly to the bases of
a differential pair and require a typical 1.35V to (V CC - 1.5V) external common-mode bias voltage.
Digital Input. Drive LOW to shut down the entire IC, drive high for normal operation. A small RC
lowpass filter can be used to filter digital noise.
Power Supply for the VCO Section. Bypass to PC board ground with a 0.1μF capacitor placed as
close to the pin as possible. Do not share capacitor ground vias with other ground connections.
IF LO Output. Provides access to the IF VCO output and can be used to drive an external PLL. It can
be disabled by logic-low on the BUF_EN control bit. IFLO is internally biased to typically 1.5V.
Differential Tank Connections for the IF VCO. TANK+ and TANK- are internally biased to
approximately 1.6V and must be AC-coupled to the external tank (can be DC-coupled if tank does
not sink or source current).
Reference Frequency Input. REF is internally biased to approximately 1.0V and must be AC-
coupled to the reference source. This is a high-impedance port and must be externally terminated
in the desired impedance.
Power Supply for the IF Charge Pump. This supply can be different from the system V CC . Bypass
to PC board ground with a minimum 0.1μF capacitor placed as close to the pin as possible. Do
not share capacitor ground vias with other ground connections.
High-Impedance IF Charge-Pump Output. Connect to the tune input of the IF VCO through the IF
PLL loop filter. Keep the connection from IFCP to the tune input as short as possible to prevent
spurious pickup.
Power Supply for Digital Circuitry. Bypass to PC board ground with a minimum 0.1μF capacitor
placed as close to the pin as possible. Do not share capacitor ground vias with other ground
connections.
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