MAX2510 查看數據表（PDF） - Maxim Integrated

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MAX2510

Low-Voltage IF Transceiver with Limiter/RSSI and Quadrature Modulator

Maxim Integrated 

Low-Voltage IF Transceiver with

Limiter/RSSI and Quadrature Modulator

RXIN

RXIN

LO

LO

RXEN

TXEN

GC

TXOUT

TXOUT

MIXOUT

IF BPF

LIMIN

VREF

gm

CZ

CZ

OFFSET

CORRECTION

LIMITER

VREF = VCC / 2

POWER

MANAGEMENT

VGA

PA

Σ

TRANSMIT VGA/PA

0°

LO PHASE

90° SHIFTER

RSSI

MAX2510

LIMOUT

LIMOUT

RSSI

I

I

Q

Q

Figure 1. Functional Diagram

_______________Detailed Description

The following sections describe each of the blocks

shown in Figure 1.

Receiver

The receiver consists of two basic blocks: the down-

converter mixer and the limiter/received-signal-strength

indicator (RSSI) section.

The receiver inputs are the RXIN and RXIN pins, which

should be AC coupled and may require a matching

network as shown in the Typical Operating Circuit. To

design a matching network for a particular application,

consult the RXIN Input Impedance plots in the Typical

Operating Characteristics, as well as the Applications

Information sections.

Downconverter Mixer

The downconverter consists of an a double-balanced

mixer and an output buffer. The MIXOUT output, a single-

ended current source, can drive a shunt-terminated

330Ω filter (165Ω load) to more than 2Vp-p over the

entire supply range, providing excellent dynamic

range. The local oscillator (LO) input is buffered and

drives the mixer.

Limiter

The signal passes through an external IF bandpass fil-

ter into the limiter input (LIMIN). LIMIN is a single-

ended input that is biased at the VREF pin voltage. The

open-circuit input impedance is typically greater than

10kΩ to VREF. For proper operation, LIMIN must be

tied to VREF through the filter-terminating impedance

(which should be less than 1kΩ). The limiter provides a

constant output level, which is largely independent of

the limiter input signal level over a 90dB input range.

The low-impedance limiter outputs provide 600mVp-p

single-ended swing (1.2Vp-p differential swing) and

can drive CMOS inputs directly.

_______________________________________________________________________________________ 9

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