Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX2065ETL+

MAX2065

50MHz to 1000MHz High-Linearity, Serial/

Parallel-Controlled Analog/Digital VGA

______________________________________________________________________________________ 23

+5V and +3.3V Supply Voltage

The MAX2065 features an optional +3.3V supply voltage

operation with slightly reduced linearity performance.

Layout Considerations

The pin configuration of the MAX2065 has been opti-

mized to facilitate a very compact physical layout of the

device and its associated discrete components.

The exposed paddle (EP) of the MAX2065’s 40-pin thin

QFN-EP package provides a low thermal-resistance

path to the die. It is important that the PCB on which the

MAX2065 is mounted be designed to conduct heat

from the EP. In addition, provide the EP with a low-

inductance path to electrical ground. The EP must be

soldered to a ground plane on the PCB, either directly

or through an array of plated via holes.

Amplitude Overshoot Reduction

To reduce amplitude overshoot during digital attenua-

tor state change, connect a bandpass filter (parallel

LC type) from ATTEN2_OUT (pin 23) to ground. L =

18nH and C = 47pF are recommended for 169MHz

operation (Figure 2). Contact the factory for recom-

mended components for other operating frequencies.

GND

C6 C7

GND

ATTEN2_OUT

GND

VCC_AMP

Figure 2. Bandpass Filter to Reduce Amplitude Overshoot

Table 6. Typical Application Circuit Component Values (LC Mode)

DESIGNATION VALUE SIZE VENDOR DESCRIPTION

C1, C2, C7, C11 10nF 0402 Murata Mfg. Co., Ltd. X7R

C3, C4, C6, C8, C9, C10 1000pF 0402 Murata Mfg. Co., Ltd. C0G ceramic capacitor

C12, C13 150pF 0402 Murata Mfg. Co., Ltd. C0G ceramic capacitor

L1 470nH 1008 Coilcraft, Inc. 1008CS-471XJLC

R1 24Ω 0402 Vishay 1%

R1A 0.01µF 0402 Murata Mfg. Co., Ltd. X7R

R2 (+3.3V applications only) 1kΩ 0402 Panasonic Corp. 1%

R3 (+3.3V applications only) 2kΩ 0402 Panasonic Corp. 1%

R4 (+5V applications and

using internal DAC only)

47kΩ 0402 Panasonic Corp. 1%

U1 —

40-pin thin QFN-EP

(6mm x 6mm)

Maxim Integrated

Products, Inc.

MAX2065ETL+