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Linear Technology Electronic Components Datasheet

LTC5585 Datasheet

Wideband IQ Demodulator

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LTC5585
FEATURES
Wideband IQ Demodulator
with IIP2 and DC Offset
Control
DESCRIPTION
n 400MHz to 4GHz Operating Frequency
n High IIP3: 28.7dBm at 700MHz, 25.7dBm at 1.95GHz
n High IIP2: 70dBm at 700MHz, 60dBm at 1.95GHz
n User Adjustable IIP2 Up to 80dBm
n User Adjustable DC Offset Null
n High Input P1dB: 16dBm at 1950MHz
n I/Q Bandwidth of 530MHz or Higher
n Image Rejection: 43dB at 1950MHz
n Noise Figure: 13.5dB at 700MHz
12.7dB at 1.95GHz
n Conversion Gain: 2.0dB at 700MHz
2.4dB at 1.95GHz
n Single-Ended RF with On-Chip Transformer
n Shutdown Mode
n Operating Temperature Range (TC): –40°C to 105°C
n 24-Lead 4mm × 4mm QFN Package
APPLICATIONS
n LTE/W-CDMA/TD-SCDMA Base Station Receivers
n Wideband DPD Receivers
n Point-To-Point Broadband Radios
n High Linearity Direct Conversion I/Q Receivers
n Image Rejection Receivers
The LTC®5585 is a direct conversion quadrature demodu-
lator optimized for high linearity receiver applications in
the 400MHz to 4GHz frequency range. It is suitable for
communications receivers where an RF signal is directly
converted into I and Q baseband signals with bandwidth
of 530MHz or higher. The LTC5585 incorporates balanced
I and Q mixers, LO buffer amplifiers and a precision, high
frequency quadrature phase shifter. The integrated on-chip
broadband transformer provides a single-ended interface
at the RF input with simple off-chip L-C matching. In ad-
dition, the LTC5585 provides four analog control voltage
interface pins for IIP2 and DC offset correction, greatly
simplifying system calibration.
The high linearity of the LTC5585 provides excellent spur-
free dynamic range for the receiver. This direct conversion
demodulator can eliminate the need for intermediate fre-
quency (IF) signal processing, as well as the corresponding
requirements for image filtering and IF filtering. These
I/Q outputs can interface directly to channel-select filters
(LPFs) or to baseband amplifiers.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Direct Conversion Receiver with IIP2 and DC Offset Calibration
5V
BPF
LNA BPF
RF
INPUT RF
VCC
I+ LPF
VGA
IA/D
LO INPUT
LO
ENABLE
EN
LTC5585
90°
IP2 AND DC
OFFSET CAL
IP2 ADJUST
DC OFFSET
IP2 AND DC
OFFSET CAL
DC OFFSET
IP2 ADJUST
Q+ LPF
Q
VGA
D/A
D/A
D/A
D/A
A/D
5585 TA01a
For more information www.linear.com/LTC5585
IIP2 vs IP2I, IP2Q Trim Voltage
120
110
I, –40°C
I, 25°C
I, 85°C
Q, –40°C
Q, 25°C
Q, 85°C
fRF = 700MHz
I, 105°C
Q, 105°C
100
90
80
70
60
50
40
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
IP2I, IP2Q (V)
5585 G09
5585fb
1


Linear Technology Electronic Components Datasheet

LTC5585 Datasheet

Wideband IQ Demodulator

No Preview Available !

LTC5585
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC Supply Voltage.................................... –0.3V to 5.5V
IV–C, AIP+, VQo+l,taQge,..C..M...I.,..C...M...Q...V..o..l.t.a..g..e....................2....5..V...t.o. VVCCCC±+0.00.53VV
VLOol+t,aLgOe o,nRAFnIynpOuttheProPwienr...................................–...0....3..V...t.o...V..C..C.2+0d0B.3mV
RF Input DC Voltage................................................ ±0.1V
Maximum Junction Temperature (TJMAX).............. 150°C
Operating Temperature Range (TC)......... –40°C to 105°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
IP2Q 1
DCOQ 2
DCOI 3
IP2I 4
RF 5
GND 6
24 23 22 21 20 19
18 CMQ
17 VCAP
25 16 LO
GND 15 LO+
14 GND
13 GND
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 150°C, θJC = 7°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC5585IUF#PBF
LTC5585IUF#TRPBF
5585
24-Lead (4mm x 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 105°C
E LECTRICAL CHARACTERISTICS TC = 25°C, VCC = 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI =
DCOQ = 0.5V, PRF = –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), PLO = 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9)
SYMBOL PARAMETER
CONDITIONS
fRF(RANGE) RF Input Frequency Range
(Note 12)
fLO(RANGE) LO Input Frequency Range
(Note 12)
PLO(RANGE) LO Input Power Range
(Note 12)
fRF1 = 700MHz, fRF2 = 701MHz, fLO = 690MHz, L6 = 2.7pF, C19 = 1.0pF, L5 = 12nH, C14 = 5.6pF
fRF(MATCH) RF Input Frequency Range
Return Loss > 10dB
fLO(MATCH) LO Input Frequency Range
Return Loss > 10dB
GV Voltage Conversion Gain
Loaded with 100Ω Pull-Up (Note 8)
NF Noise Figure
Double-Side Band (Note 4)
NFBLOCKING Noise Figure Under Blocking Conditions
IIP3 Input 3rd Order Intercept
Double-Side Band, PRF = 0dBm (Note 7)
IIP2 Input 2nd Order Intercept
Unadjusted, EIP2 = 0V
IIP2OPT
P1dB
Optimized Input 2nd Order Intercept
Input 1dB Compression
EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2
MIN TYP MAX
0.4 to 4.0
0.4 to 4.0
0 to 10
680 to 870
690 to 820
2.0
13.5
15.5
28.7
70
80
16
UNITS
GHz
GHz
dBm
MHz
MHz
dB
dB
dB
dBm
dBm
dBm
dBm
5585fb
2 For more information www.linear.com/LTC5585


Part Number LTC5585
Description Wideband IQ Demodulator
Maker Linear
Total Page 30 Pages
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