LTC6602IUF#PBF Linear Technology, LTC6602IUF#PBF Datasheet

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LTC6602IUF#PBF

Manufacturer Part Number
LTC6602IUF#PBF
Description
IC FILTER BANDPASS/LOWPASS 24QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LTC6602IUF#PBF

Filter Type
Bandpass
Frequency - Cutoff Or Center
300kHz
Number Of Filters
2
Max-order
5th
Voltage - Supply
2.7 V ~ 3.6 V
Mounting Type
Surface Mount
Package / Case
24-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
TRANSMITTER
Matched Dual Filter/Driver, Ideal for RFID Readers
Guaranteed Phase Matching to Within 2 Degrees
Guaranteed Gain Matching to Within 0.2dB
Configurable as Lowpass or Bandpass:
– Programmable 5th Order Lowpass: 42kHz to 900kHz
– Programmable 4th Order Highpass: 4.2kHz to 90kHz
Programmable Gain: 1×, 4×, 16×, 32×
Simple Pin Programming or SPI Interface
Low Noise: –145dBm/Hz (Input Referred)
Low Distortion: –75dBc at 200kHz
Differential, Rail-to-Rail Inputs and Outputs
Input Range Extends from 0V to 5V
Low Voltage Operation: 2.7V to 3.6V
Shutdown Mode
4mm × 4mm QFN Package
Multiprotocol RFID Readers: EPC-GEN2, ISD and IPX
IDEN, PHS, GSM Basestations
Repeaters, Radio Links, and Modems
Wireless Telemetry
JTRS
38.3k
INPUT
FROM
MUTE
0.1µF
Q INPUT
I INPUT
UHF RFID Reader Dual Baseband Filter and Dual ADC
+INA
–INA
+INB
–INB
R
V
MUTE
GAIN0(D0)
GAIN1
GND
GND
V+
BIAS
OCM
IN
LTC6602
0.1µF
LPF0(SCLK)
HPF0(SDO)
V+
HPF1(SDI)
CLKCNTL
LPF1(CS)
A
–OUTA
+OUTA
–OUTB
+OUTB
CLKIO
3V
V+
SER
D
SPI CONTROL INPUT
CS SCLK SDI
(COVERS THE TAG BACKSCATTER LINK FREQUENCY RANGE OF 40kHz to 640kHz
0.1µF
I OUTPUT
Q OUTPUT
OF THE CLASS 1 GENERATION 2 UHF RFID COMMUNICATION PROTOCOL)
Frequency Bandpass/Lowpass Filters
100Ω
100Ω
100Ω
100Ω
24MHz TO 128MHz
CLOCK INPUT
100pF
100pF
100pF
100pF
2.2µF
100pF
100pF
A
A
B
B
IN
IN
IN
IN
DESCRIPTION
The LTC
or lowpass filter and differential driver. The selectivity of the
LTC6602, combined with its phase matching and dynamic
range, make it ideal for filtering in RFID systems. With two
degree phase matching between channels, the LTC6602 can
be used in applications requiring highly matched filters,
such as transceiver I and Q channels. Gain programmabil-
ity, and the fully differential inputs and outputs, simplify
implementation in most systems.
Both channels of the LTC6602 consist of a programmable
lowpass and highpass filter. For bandpass functionality,
the lowpass filters are programmed for the upper cutoff
frequency. For lowpass functionality, the highpass filters
can be bypassed. The filter cutoff frequencies can be set
with a guaranteed accuracy of 3% with the use of a single
resistor. Alternatively, the filter cutoff frequencies can be
controlled with an external clock.
The LTC6602 operates on a single 2.7V to 3.6V supply
and features a low power shutdown mode.
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.
+
+
V
CM
LTC2297
CLK IN
14-BIT
14-BIT
ADC
ADC
÷4
®
6602 TA01
6602 is a dual, matched, programmable bandpass
Dual Matched, High
–10
–20
–30
–40
–50
–60
20
10
0
1k
EXTERNAL CLOCK = 90MHz
45kHz-300kHz BPF
Gain vs Frequency
10k
FREQUENCY (Hz)
100k
LTC6602
15kHz-150kHz BPF
90kHz-900kHz BPF
1M
6602 TA01b
10M
6602fc
1

Related parts for LTC6602IUF#PBF

LTC6602IUF#PBF Summary of contents

Page 1

... The LTC6602 operates on a single 2.7V to 3.6V supply and features a low power shutdown mode. 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. 100Ω ...

Page 2

... LEAD FREE FINISH TAPE AND REEL LTC6602CUF#PBF LTC6602CUF#TRPBF LTC6602IUF#PBF LTC6602IUF#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T 300kHz, highpass cutoff = 45kHz, internal clocking with R PARAMETER CONDITIONS Filter Phase External Clock = 90MHz, V Either Channel Lowpass Filter Cutoff = 300kHz f = 50kHz ...

Page 4

LTC6602 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T 300kHz, highpass cutoff = 45kHz, internal clocking with R PARAMETER CONDITIONS PGA Gain Lowpass Cutoff = 150kHz, Highpass Filter Bypassed, Measured at DC, 0.6V to 2.4V Each Output Gain Setting ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T 300kHz, highpass cutoff = 45kHz, internal clocking with R PARAMETER CONDITIONS Supply Current, Sum of the Currents into V+ Shutdown Mode Shutdown Via Serial Interface, Control Bit Supply ...

Page 6

LTC6602 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T Pin Programmable Control Mode Specifications SYMBOL PARAMETER V+ = 2. Digital Input High Voltage IH V Digital Input Low Voltage IL I Digital Input Current IN ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Gain vs Frequency 25° EXTERNAL CLOCK 15kHz-150kHz BPF R = 54.9k 90kHz-900kHz BPF BIAS 0 GAIN = 0dB –10 –20 –30 –40 –50 45kHz-300kHz BPF –60 1k 10k ...

Page 8

LTC6602 TYPICAL PERFORMANCE CHARACTERISTICS Common Mode Rejection 120 CMR = ΔV /ΔV IN-CM OUT-DIFF 110 100 GAIN = 12dB 90 GAIN = 0dB 80 GAIN = 24dB 70 GAIN = 30dB 25° ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance vs Frequency 100 T = 25° 54.9k BIAS 10 15kHz-150kHz BPF 90kHz-900kHz BPF 1 900kHz LPF 45kHz-300kHz BPF 0.1 1k 10k 100k 1M FREQUENCY (Hz) 6602 G19 Clock ...

Page 10

LTC6602 PIN FUNCTIONS V+ (Pin 1): Input Voltage Supply (2.7V ≤ V ≤ 5.5V). This IN supply must be kept free from noise and ripple. It should be bypassed directly to a ground plane with a 0.1µF ca- pacitor unless ...

Page 11

PIN FUNCTIONS CLKIO (Pin 15): When CLKCNTL (Pin 5) is tied to ground, CLKIO is the master clock input. When CLKCNTL is floated, CLKIO is pulled to ground by a weak, 5µA pulldown. When CLKCNTL is tied to V+ (Pin ...

Page 12

LTC6602 BLOCK DIAGRAM +INA DDA 1. OCM 1.6k GND R 4 BIAS CLKCNTL 5 LPF1(CS +INB TIMING DIAGRAM SCLK D3 SDI ...

Page 13

APPLICATIONS INFORMATION Theory of Operation (Refer to Block Diagram) The LTC6602 features two matched filter channels, each containing gain control, lowpass, and highpass networks that are controlled by a single control block and clocked by a single clock generator. The ...

Page 14

LTC6602 APPLICATIONS INFORMATION V+ D (INTERNAL NODE) 6602 F02 Figure 2. Bidirectional Design of HPFO(SDO) and GAIN0(D0) Pins 3.3V 0.1µ IN1 – LPF1(CS) SCLK µP SDI SCLK D15 D11 SDI GAIN, BW CONTROL WORD FOR #2 CS Serial ...

Page 15

APPLICATIONS INFORMATION Serial Interface Connecting SER to ground allows the filter to be controlled through the SPI serial interface. When CS is low, the serial data on SDI is shifted into an 8-bit shift-register on the rising edge of the ...

Page 16

LTC6602 APPLICATIONS INFORMATION are shown in Table 3. When the LTC6602 is programmed for the lowest lowpass cutoff frequency (LPF1, LPF0 = ‘0’), the power is automatically reduced by about 35%. Table 2. Cutoff Frequency Control, R BIAS LOWPASS LPF1 ...

Page 17

APPLICATIONS INFORMATION Preserving Oscillator Accuracy The oscillator is sensitive to transients on the positive supply. The IC should be soldered to the PC board and the PCB layout should include a 0.1µF ceramic capacitor (Pin 2) and ground, as close ...

Page 18

LTC6602 APPLICATIONS INFORMATION – 25° 100kHz IN DIFFERENTIAL INPUT 1. 54.9k BIAS –75 45kHz-300kHz BPF GAIN = 0dB HD3 –80 HD2 –85 –90 0 0.5 1.0 1.5 2.0 COMMON MODE ...

Page 19

APPLICATIONS INFORMATION – 25° 100kHz IN – 1. 54.9k BIAS –40 45kHz-300kHz BPF GAIN = 0dB –50 –60 HD3 –70 –80 HD2 –90 0.5 1.0 1.5 COMMON MODE OUTPUT ...

Page 20

LTC6602 APPLICATIONS INFORMATION 3.3V 0.1µ +INA V IN1 – –INA CLKCNTL CLKIO GND If the lowpass cutoff frequency varies then the Figure 12b circuit must be used. The output common mode voltage is equal to the ...

Page 21

APPLICATIONS INFORMATION Mute Function The LTC6602 features a mute function which is asserted by pulling MUTE (Pin 20) to ground. This breaks the signal path that leads from the input pins to the filter networks, attenuating the input signal by ...

Page 22

LTC6602 APPLICATIONS INFORMATION 100 HPF1 = 0 HPF1 = 0 HPF0 = 0 HPF0 = 1 HPF1 = 1 HPF0 = 10k 100k FILTER CUTOFF FREQUENCY (Hz) Figure 15 Filter Cutoff Frequencies CLK Table 5. ...

Page 23

APPLICATIONS INFORMATION The LTC6602, an Adaptable Baseband Filter for an RFID Reader A radio-frequency identification (RFID) system is an auto-id technology that identifies any object that contains a coded tag. An RFID system consists of a reader (or interrogator) and ...

Page 24

LTC6602 APPLICATIONS INFORMATION detecting the symbol sequence (in an RFID environment, noise will be superimposed on the output signal). In general, increasing the lowpass f CUTOFF SPI CONTROL OF DAC SETS THE LTC6602 CLOCK FREQUENCY 40MHz TO 100MHz 1 6 ...

Page 25

TYPICAL APPLICATIONS PARALLEL CONTROL SOT-363 CLK1 CLK0 BIAS1 BIAS2 BIAS3 BIAS4 R > BIAS1 BIAS2 BIAS3 R = 4941 BIAS f CLK ...

Page 26

LTC6602 PACKAGE DESCRIPTION 4.50 ± 0.05 2.45 ± 0.05 (4 SIDES) 3.10 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 4.00 ± 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) NOTE: 1. DRAWING PROPOSED TO BE MADE A JEDEC ...

Page 27

... Updated all Max values for Supply Current in Electrical Characteristics section Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 28

... GAIN0(D0) HPF0(SDO GAIN1 HPF1(SDI GND LPF0(SCLK GND LPF1(CS) CS SCLK SDI SPI CONTROL INPUT VOCM INPUT FROM ADC ≤ 5MHz, Low Noise, Rail-to-Rail c LT 1010 REV C • PRINTED IN USA  LINEAR TECHNOLOGY CORPORA TION 2008 CLOCK INPUT 6602 TA03 6602fc ...

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