LTC6602IUF-PBF datasheet, PDF - EEWORLD Datasheet

FEATURES

n

LTC6602

Dual Matched, High

Frequency Bandpass/Lowpass Filters

DESCRIPTION

The LTC

®

6602 is a dual, matched, programmable bandpass

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 and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners..

n

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

APPLICATIONS

n

Multiprotocol RFID Readers:

EPC-GEN2, ISD and IPX

IDEN, PHS, GSM Basestations

Repeaters, Radio Links, and Modems

Wireless Telemetry

JTRS

TYPICAL APPLICATION

UHF RFID Reader Dual Baseband Filter and Dual ADC

3V

0.1μF

20

100Ω

100pF

V+

IN

+INA

I INPUT

Q INPUT

38.3k

0.1μF

–INA

+INB

–INB

R

BIAS

V

OCM

MUTE

INPUT

FROM

TRANSMITTER

LTC6602

V+

A

V+

D

–OUTA

+OUTA

–OUTB

+OUTB

CLKIO

SER

CLKCNTL

100Ω

100pF

B

IN–

Q OUTPUT

100Ω

2.2μF

B

IN+

14-BIT

ADC

I OUTPUT

V

CM

LTC2297

100Ω

100pF

A

IN–

A

IN+

14-BIT

ADC

10

0

GAIN (dB)

–10

–20

–30

–40

–50 45kHz-300kHz BPF

–60

1k

10k

100k

1M

FREQUENCY (Hz)

10M

6602 TA01b

Gain vs Frequency

EXTERNAL CLOCK = 90MHz

15kHz-150kHz BPF

90kHz-900kHz BPF

GAIN0(D0) HPF0(SDO)

GAIN1

GND

HPF1(SDI)

LPF0(SCLK)

LPF1(CS)

CS

SCLK SDI

SPI CONTROL INPUT

÷4

CLK IN

6602 TA01

CLOCK INPUT

24MHz TO 128MHz

(COVERS THE TAG BACKSCATTER LINK FREQUENCY RANGE OF 40kHz to 640kHz

OF THE CLASS 1 GENERATION 2 UHF RFID COMMUNICATION PROTOCOL)

6602fa

1

LTC6602

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

TOP VIEW

GAIN0(D0)

+OUTA

18 –OUTA

17

SER

25

16 V+

D

15 CLKIO

14 GND

13 +OUTB

7

+INB

8

–INB

9 10 11 12

LPFO(SCLK)

HPF1(SDI)

HPFO(SDO)

–OUTB

GAIN1

MUTE

+INA

V+

IN

1

V+

A

2

V

OCM

3

R

BIAS

4

CLKCNTL 5

LPF1(CS) 6

–INA

V+

IN

to GND ................................................................6V

V+

A,

V+

D

to GND .........................................................4V

Filter Inputs to GND ....................... –0.3V to V+

IN

+ 0.3V

All Other Pins to GND.............. –0.3V to V+

A

, V+

D

+ 0.3V

Maximum Input Current .......................................±10mA

Output Short Circuit Duration........................... Indeﬁnite

Operating Temperature Range (Note 2)

LTC6602CUF ........................................ –40°C to 85°C

LTC6602IUF ......................................... –40°C to 85°C

Speciﬁed Temperature Range (Note 3)

LTC6602CUF ............................................ 0°C to 70°C

LTC6602IUF ......................................... –40°C to 85°C

Storage Temperature Range................... –65°C to 150°C

24 23 22 21 20 19

UF PACKAGE

24-LEAD (4mm

×

4mm) PLASTIC QFN

T

JMAX

= 150°C,

θ

JA

= 37°C/W

EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO THE PCB.

ORDER INFORMATION

LEAD FREE FINISH

LTC6602CUF#PBF

LTC6602IUF#PBF

TAPE AND REEL

LTC6602CUF#TRPBF

LTC6602IUF#TRPBF

PART MARKING*

6602

PACKAGE DESCRIPTION

24-Lead (4mm × 4mm) Plastic QFN

SPECIFIED TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

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.linear.com/tapeandreel/

The

l

denotes the speciﬁcations which app ly over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V+

A

= V+

D

= V+

IN

= 3V, V

ICM

= V

OCM

= 1.5V, Gain = 0dB, lowpass cutoff =

300kHz, highpass cutoff = 45kHz, internal clocking with R

BIAS

= 54.9k unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Filter Gain Either Channel External Clock = 90MHz, Highpass Filter Cutoff = 45kHz,

Gain = 0dB

Lowpass Filter Cutoff = 300kHz, V

IN

= 3.6V

P-P

f

IN

= 22.5kHz

f

IN

= 45kHz

f

IN

= 150kHz

f

IN

= 300kHz

f

IN

= 900kHz

Matching of Filter Gain

External Clock = 90MHz, Highpass Filter Cutoff = 45kHz,

Lowpass Filter Cutoff = 300kHz, V

IN

= 3.6V

P-P

f

IN

= 45kHz

f

IN

= 150kHz

f

IN

= 300kHz

ELECTRICAL CHARACTERISTICS

l

–1.8

0.1

–2.7

–32

–1.2

0.5

–2

–44

–30

–0.8

0.8

–1.2

–43

dB

l

±0.2

dB

6602fa

2

LTC6602

ELECTRICAL CHARACTERISTICS

PARAMETER

Filter Phase

Either Channel

CONDITIONS

External Clock = 90MHz, V

IN

= 3.6V

P-P

, Highpass Filter Cutoff = 45kHz,

Lowpass Filter Cutoff = 300kHz

f

IN

= 50kHz

f

IN

= 250kHz

External Clock = 90MHz, V

IN

= 3.6V

P-P

, Highpass Filter Cutoff = 45kHz,

Lowpass Filter Cutoff = 300kHz

f

IN

= 50kHz

f

IN

= 250kHz

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V+

A

= V+

D

= V+

IN

= 3V, V

ICM

= V

OCM

= 1.5V, Gain = 0dB, lowpass cutoff =

300kHz, highpass cutoff = 45kHz, internal clocking with R

BIAS

= 54.9k unless otherwise noted.

MIN

TYP

MAX

UNITS

l

125

–134

130

–130

134

–126

deg

Matching of Filter Phase

l

±2

±1.5

deg

Filter Gain Either Channel External Clock = 90MHz, Highpass Filter Cutoff = 15kHz,

Gain = 0dB

Lowpass Filter Cutoff = 150kHz, V

IN

= 3.6V

P-P

f

IN

= 7.5kHz

f

IN

= 15kHz

f

IN

= 50kHz

f

IN

= 150kHz

f

IN

= 450kHz

Matching of Filter Gain

External Clock = 90MHz, V

IN

= 3.6V

P-P

, Highpass Filter Cutoff = 15kHz,

Lowpass Filter Cutoff = 150kHz

f

IN

= 15kHz

f

IN

= 50kHz

f

IN

= 150kHz

External Clock = 90MHz, V

IN

= 3.6V

P-P

, Highpass Filter Cutoff = 15kHz,

Lowpass Filter Cutoff = 150kHz

f

IN

= 16.5kHz

f

IN

= 125kHz

External Clock = 90MHz, V

IN

= 3.6V

P-P

, Highpass Filter Cutoff = 15kHz,

Lowpass Filter Cutoff = 150kHz

f

IN

= 16.5kHz

f

IN

= 125kHz

l

–1.6

0.4

–2.3

–32

–1.2

0.7

–1.9

–44

–30

–0.8

0.9

–1.3

–43

dB

l

±0.2

dB

Filter Phase Either

Channel

l

137

–142

142

–138

146

–134

deg

Matching of Filter Phase

l

±2

±1

deg

Filter Gain Either Channel External Clock = 90MHz, Highpass Filter Cutoff = 90kHz,

Gain = 0dB

Lowpass Filter Cutoff = 900kHz, V

IN

= 3.6V

P-P

f

IN

= 45kHz

f

IN

= 90kHz

f

IN

= 300kHz

f

IN

= 900kHz

f

IN

= 2700kHz

Matching of Filter Gain

External Clock = 90MHz, Highpass Filter Cutoff = 90kHz,

Lowpass Filter Cutoff = 900kHz, V

IN

= 3.6V

P-P

f

IN

= 90kHz

f

IN

= 300kHz

f

IN

= 900kHz

l

–1.8

–0.1

–2.1

–29

–1.2

0.6

–1.1

–45

–27

–0.7

1.2

–0.5

–44

dB

l

±0.3

±0.6

±0.4

dB

Filter Phase Either Chanel External Clock = 90MHz, V

IN

= 3.6V

P-P

, Highpass Filter Cutoff = 90kHz,

Lowpass Filter Cutoff = 900kHz

f

IN

= 100kHz

f

IN

= 750kHz

Matching of Filter Phase

External Clock = 90MHz, V

IN

= 3.6V

P-P

, Highpass Filter Cutoff = 90kHz,

Lowpass Filter Cutoff = 900kHz

f

IN

= 100kHz

f

IN

= 750kHz

CLKCNTL = 3V (Note 4)

R

BIAS

= 200k, Output Clock = 24.705MHz

R

BIAS

= 54.9k, Output Clock = 90MHz

l

136

–136

141

–131

145

–127

deg

l

±2

±1.5

±3

deg

%

Filter Cutoff Accuracy

when Self Clocked

6602fa

3

LTC6602

ELECTRICAL CHARACTERISTICS

PARAMETER

PGA Gain

CONDITIONS

Lowpass Cutoff = 150kHz, Highpass Filter Bypassed,

Measured at DC, 0.6V to 2.4V Each Output

Gain Setting = 0dB

Gain Setting = 12dB

Gain Setting = 24dB

Gain Setting = 30dB

Lowpass Cutoff = 150kHz, Highpass Filter Bypassed,

Measured at DC, 0.6V to 2.4V Each Output

Gain Setting = 0dB

Gain Setting = 12dB

Gain Setting = 24dB

Gain Setting = 30dB

Voltage Noise Referred to the Input

Gain = 0dB

Gain = 12dB

Gain = 24dB

Gain = 30dB

Noise Bandwidth = 1.57MHz (Note 5), Referred to the Input

Gain = 0dB

Gain = 12dB

Gain = 24dB

Gain = 30dB

V

IN

= 1.5V

P-P

, f

IN

= 100kHz

Differential

Common Mode

Differential Offset Voltage at Either Output

Differential Offset Voltage at Either Output HPF Bypassed, Lowest LPF Cutoff

Differential Offset Voltage at Either Output HPF Bypassed, Highest LPF Cutoff

Common Mode Offset Voltage

V

OCM

= 1.5V, Supplies = 3V

V

OSCM

= V

OUT-CM

– V

OCM

Common Mode Input from 0 to 3V

V+

IN

= 3V

Common Mode Input from 0 to 5V

V+

IN

= 5V

V+

A

= V+

D

= 3V, Pin 3 Open

V+

A

= V+

D

= 3V, Pin 3 Open

Lowpass Cutoff = 150kHz, Highpass Filter Bypassed, Measured at DC

Source 1mA, V

OUT

High, Relative to V+

A

Sink 1mA, V

OUT

Low, Relative to GND

Lowpass Cutoff = 150kHz, Highpass Filter Bypassed

Sourcing

Sinking

Internal Clock (R

BIAS

= 54.9k); Sum of the Currents into V+

D

, V+

A

, and

V+

IN

All Supplies Set to 3V

HPF = 15k, LPF = 150k

HPF = 45k, LPF = 300k

HPF = 90k, LPF = 900k

l

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V+

A

= V+

D

= V+

IN

= 3V, V

ICM

= V

OCM

= 1.5V, Gain = 0dB, lowpass cutoff =

300kHz, highpass cutoff = 45kHz, internal clocking with R

BIAS

= 54.9k unless otherwise noted.

MIN

TYP

MAX

UNITS

l

0.4

11.6

23.5

29.1

0.8

12

23.8

29.6

1.2

12.4

24.1

30.1

dB

PGA Gain Matching

l

±0.2

±0.3

–119

–131

–142

–146

–62

–74

–85

–89

–75

16

20

±7

±10

–40

±20

±15

±30

70

dB

dBm/Hz

dBm

dB

kΩ

mV

Noise At 200kHz

Integrated Noise

THD

Input Impedance

V

OS

Differential

V

OSCM

CMR Differential

ΔV

INCM

/ΔV

OUTDIFF

l

75

1.2

300

95

1.4

400

1.6

700

dB

V

Ω

V

OCM

Pin Voltage

V

OCM

Pin Input

Impedance

Output Swing

l

200

4

10

15

25

500

25

50

mV

mA

Short-Circuit Current

Supply Current

l

65

100

105

80

125

130

mA

6602fa

4

LTC6602

ELECTRICAL CHARACTERISTICS

PARAMETER

Supply Current,

Shutdown Mode

Supply Voltage

PSR

R

BIAS

Resistor Range

R

BIAS

Pin Voltage

Clock Frequency Drift

Over Temperature

Clock Frequency Change

Over Supply

Output Clock Duty Cycle

CLKIO Pin High Level

Input Voltage

CLKIO Pin Low Level

Input Voltage

CLKIO Pin Input Current

CONDITIONS

Sum of the Currents into V+

D

, V+

A

, and V+

IN

; All Supplies Set to 3V

Shutdown Via Serial Interface, Control Bit D1 = 1.

V+

D

, V+

A

Relative to GND

V+

IN

Relative to GND

V+

D

= V+

A

= V+

IN

, All from 2.7V to 3.6V

V+

D

= V+

A

= 3.0V, V+

IN

from 4.5V to 5.5V

Clock Frequency Error ≤ ±3%, CLKCNTL = 3V

54.9k < R

BIAS

< 200k

R

BIAS

= 54.9k, CLKCNTL Pin Open

V+

A

, V+

D

from 2.7V to 3.6V, R

BIAS

= 54.9k, CLKCNTL Pin Open

R

BIAS

= 54.9k

CLKCNTL = 0V (Note 6)

CLKCNTL = 0V

CLKIO = 0V (Note 7)

CLKIO = V+

D

V+

A

= V+

D

= 3V, CLKCNTL = 3V

I

OH

= –1mA

I

OH

= –4mA

V+

A

= V+

D

= 3V, CLKCNTL = 3V

I

OL

= 1mA

I

OL

= 4mA

V+

A

= V+

D

= CLKCNTL = 3V, 20%/80%, C

LOAD

= 5pF

V+

A

= V+

D

= CLKCNTL = 3V, 20%/80%, C

LOAD

= 5pF

Pins 17, 20

Pin 17 or Pin 20 = 0V (Note 7)

Pin 17 or Pin 20 = V+

D

Pin 5

CLKCNTL = 0V (Note 7)

CLKCNTL = V+

D

l

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V+

A

= V+

D

= V+

IN

= 3V, V

ICM

= V

OCM

= 1.5V, Gain = 0dB, lowpass cutoff =

300kHz, highpass cutoff = 45kHz, internal clocking with R

BIAS

= 54.9k unless otherwise noted.

MIN

TYP

170

2.7

50

80

54.9

1.17

40

–0.6

25

V

+D

– 0.3

0.3

0.1

50

0.6

75

60

95

200

MAX

235

3.6

5.5

UNITS

μA

V

dB

kΩ

V

ppm/ºC

%/V

%

V

l

–1

10

2.95

2.9

0.05

0.1

0.3

V

+D

– 0.3

0.3

–10

2

V

+D

– 0.5

0.5

–25

–15

15

μA

V

ns

V

μA

V

μA

CLKIO Pin High Level

Output Voltage

CLKIO Pin Low Level

Output Voltage

CLKIO Rise Time

CLKIO Fall Time

SER, MUTE

High Level Input Voltage

SER, MUTE

Low Level Input Voltage

SER, MUTE

Input Current

CLKCNTL High Level

Input Voltage

CLKCNTL Low Level

Input Voltage

CLKCNTL Input Current

25

6602fa

5

LTC6602IUF-PBF

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