LTC5567IUF#PBF Datasheet LTC5567IUF#PBF, LTC5567IUF#TRPBF | P10-P12

LTC5567

5567f

TesT circuiT

0.015"

0.062"

0.015"

GND

BIAS

GND

DC1861A

EVALUATION BOARD

LAYER STACK-UP

(NELCO N4000-13)

50Ω

5567 F01

50Ω

3.3V

89mA

LTC5567

–

IADJNC

GND

TEMP

GND GND

65 7 8

GND

GND NC GND

16 1415 13

OUT

50Ω

0Ω

APPLICATION RF MATCH LO MATCH

RF (MHz) LO C3 C4 L3 C5 C6

300 to 400 HS 120pF 18pF 2.2nH 47pF 15pF

400 to 500 HS 120pF 12pF 2nH 27pF 10pF

700 to 1000 HS 120pF 4.7pF — 6.8pF 2.7pF

1400 to 3000 LS, HS 2.7pF — — 3.9pF —

3000 to 4000 LS 3.9pF 0.7pF — 3.9pF —

LS = Low side, HS = High side

REF DES VALUE SIZE VENDOR REF DES VALUE SIZE VENDOR

C1, C2 10nF 0402 AVX C9 1µF 0603 AVX

C3 - C6 See Table 0402 AVX T1 4:1 — Mini-Circuits TC8-1-10LN+

C7, C8 330pF 0402 AVX L1, L2 300nH 0603 Coilcraft 0603HP

R1, R2 3.01k, 1% 0402 L3 See Table 0402 Coilcraft 0402HP

Figure 1. Standard Downmixer Test Circuit Schematic (153MHz Bandpass IF Matching)

LTC5567

5567f

applicaTions inForMaTion

Introduction

The LTC5567 incorporates a high linearity double-balanced

active mixer, a high-speed limiting LO buffer and bias/

enable circuits. See the Pin Functions and Block Diagram

sections for a description of each pin. A test circuit sche-

matic showing all external components required for the

data sheet specified performance is shown in Figure 1.

A few additional components may be used to modify the

DC supply current or frequency response, which will be

discussed in the following sections.

The LO and RF inputs are single ended. The IF output is

differential. Low side or high side LO injection may be

used. The test circuit, shown in Figure 1, utilizes bandpass

IF output matching and an 8:1 IF transformer to realize a

50Ω single-ended IF output. The evaluation board layout

is shown in Figure 2.

RF Input

A simplified schematic of the mixer’s RF input is shown

in Figure 3. As shown, one terminal of the integrated RF

transformer’s primary winding is connected to Pin 3, while

the other terminal is DC-grounded internally. For this rea-

son, a series DC-blocking capacitor (C3) is needed if the

RF source has DC voltage present. The DC resistance of

the primary winding is approximately 4Ω. The secondary

winding of the RF transformer is internally connected to

the RF buffer amplifier.

The RF input is 50Ω matched from 1400MHz to 3000MHz

with a single 2.7pF series capacitor on the input. Matching

to RF frequencies above or below this frequency range is

easily accomplished by adding shunt capacitor C4, shown

in Figure 3. For RF frequencies below 500MHz, series

Figure 2. Evaluation Board Layout

LTC5567

5567f

applicaTions inForMaTion

inductor L3 is also needed. The evaluation board does

not have provisions for L3, so the RF input trace needs

to be cut to install it in series. The RF input matching ele-

ment values for each application are tabulated in Figure 1.

Measured RF input return losses are shown in Figure 4.

The RF input impedance and input reflection coefficient,

versus frequency are listed in Table 1.

Table 1. RF Input Impedance and S11 (At Pin 3, No External

Matching, Mixer Enabled)

FREQUENCY

(MHz)

INPUT

IMPEDANCE

S11

MAG ANGLE

200 6.0 + j8.0 0.79 161.6

350 9.0 + j11.9 0.71 152.1

450 11.0 + j14.1 0.66 147.0

575 13.3 + j15.9 0.61 142.5

700 15.4 + j17.5 0.57 138.1

900 18.5 + j20.0 0.52 131.1

1100 21.7 + j22.0 0.48 125.1

1400 27.4 + j24.2 0.41 115.6

1700 33.7 + j24.2 0.33 107.9

1950 39.1 + j21.6 0.26 103.1

2200 42.6 + j16.1 0.19 104.9

2450 42.6 + j9.9 0.13 120.8

2700 38.8 + j4.3 0.14 155.9

3000 31.9 + j2.3 0.22 171.3

3300 24.8 + j4.0 0.34 167.9

3600 19.5 + j8.2 0.45 158.3

3900 15.4 + j13.4 0.56 147.3

4200 12.6 + j18.7 0.64 136.8

4500 10.9 + j24.2 0.70 126.6

LO Input

A simplified schematic of the LO input, with external

components is shown in Figure 5. Similar to the RF in-

put, the integrated LO transformer’s primary winding is

DC-grounded internally, and therefore requires an external

DC-blocking capacitor. Capacitor C5 provides the neces-

sary DC-blocking, and optimizes the LO input match over

the 1GHz to 4GHz frequency range. The nominal LO input

level is 0dBm although the limiting amplifiers will deliver

excellent performance over a ±5dB input power range. LO

input power greater than +6dBm may cause conduction

of the internal ESD diodes.

To optimize the LO input match for frequencies below

1GHz, the value of C5 is increased and shunt capacitor C6

is added. A summary of values for C5 and C6, versus LO

BUFFER

5569 F05

LTC5567

Figure 5. LO Input Schematic

BUFFER

5567 F03

LTC5567

Figure 3. RF Input Schematic

Figure 4. RF Input Return Loss

FREQUENCY (GHz)

0.2

RETURN LOSS (dB)

–15

–10

–5

3.2

5567 F04

–20

–25

1.2 2.20.7 3.71.7 2.7 4.74.2

–30

–35

400MHz TO 500MHz APP.

700MHz TO 1000MHz APP.

1400MHz TO 3000MHz APP.

3GHz TO 4GHz APP.

= 25°C

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P20

LTC5567IUF#PBF

Mfr. #:

Buy LTC5567IUF#PBF

Manufacturer:

Analog Devices Inc.

Description:

RF Mixer 300MHz - 4GHz High Linearity Active Downconverting Mixer with Wideband IF

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

LTC5567IUF#PBF

LTC5567IUF#PBF

Products related to this Datasheet