LTC2234IUK Linear Technology, LTC2234IUK Datasheet

IC ADC 10BIT 135MSPS SAMPL 48QFN

LTC2234IUK

Manufacturer Part Number
LTC2234IUK
Description
IC ADC 10BIT 135MSPS SAMPL 48QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LTC2234IUK

Number Of Bits
10
Sampling Rate (per Second)
135M
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
680mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-WFQFN, Exposed Pad
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC2234IUK#PBF
Manufacturer:
Linear Technology
Quantity:
135
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
ANALOG
INPUT
REFH
REFL
Sample Rate: 135Msps
61dB SNR up to 200MHz Input
75dB SFDR up to 400MHz Input
775MHz Full Power Bandwidth S/H
Single 3.3V Supply
Low Power Dissipation: 630mW
CMOS Outputs
Selectable Input Ranges: ±0.5V or ±1V
No Missing Codes
Optional Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Data Ready Output Clock
Pin Compatible Family
48-Pin 7mm × 7mm QFN Package
Wireless and Wired Broadband Communication
Cable Head-End Systems
Power Amplifier Linearization
Communications Test Equipment
135Msps: LTC2224 (12-Bit), LTC2234 (10-Bit)
105Msps: LTC2222 (12-Bit), LTC2232 (10-Bit)
80Msps: LTC2223 (12-Bit), LTC2233 (10-Bit)
+
CLOCK/DUTY
REFERENCE
INPUT
CONTROL
FLEXIBLE
ENCODE
S/H
CYCLE
INPUT
U
PIPELINED
ADC CORE
10-BIT
U
3.3V
V
DD
CORRECTION
LOGIC
DRIVERS
OUTPUT
2234 TA01
DESCRIPTIO
The LTC
verter designed for digitizing high frequency, wide dy-
namic range signals. The LTC2234 is perfect for demand-
ing communications applications with AC performance
that includes 60.5dB SNR and 75dB spurious free dy-
namic range for signals up to 400MHz. Ultralow jitter of
0.15ps
excellent noise performance.
DC specs include ±0.2LSB INL (typ), ±0.1LSB DNL (typ)
and ±0.8LSB INL, ±0.6LSB DNL over temperature. The
transition noise is a low 0.12LSB
A separate output power supply allows the CMOS output
swing to range from 0.5V to 3.6V.
The ENC
single ended with a sine wave, PECL, LVDS, TTL, or CMOS
inputs. An optional clock duty cycle stabilizer allows high
performance at full speed for a wide range of clock duty
cycles.
All other trademarks are the property of their respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation.
OGND
0.5V TO 3.6V
OV
DD
D9
D0
RMS
®
+
2234 is a 135Msps, sampling 10-bit A/D con-
and ENC
allows undersampling of IF frequencies with
10-Bit, 135Msps ADC
U
inputs may be driven differentially or
90
85
80
75
70
65
60
55
50
0
SFDR vs Input Frequency
100
INPUT FREQUENCY (MHz)
200
2nd OR 3rd
RMS
300
.
4th OR HIGHER
LTC2234
400
500
2234 TA01b
600
2234fa
1

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LTC2234IUK Summary of contents

Page 1

... PECL, LVDS, TTL, or CMOS inputs. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 3. ...

Page 2

... EXPOSED PAD IS GND (PIN 49), ORDER PART NUMBER LTC2234CUK LTC2234IUK Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

Page 3

ALOG I PUT The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are 25°C. (Note 4) A SYMBOL PARAMETER V Analog Input Range ( Analog ...

Page 4

LTC2234 TER AL REFERE CE CHARACTERISTICS PARAMETER V Output Voltage CM V Output Tempco CM V Line Regulation CM V Output Resistance DIGITAL I PUTS A D DIGITAL OUTPUTS full operating temperature range, ...

Page 5

W U POWER REQUIRE E TS range, otherwise specifications are at T SYMBOL PARAMETER V Analog Supply Voltage DD OV Output Supply Voltage DD I Analog Supply Current VDD P Power Dissipation DISS P Shutdown Power SHDN P Nap Mode ...

Page 6

LTC2234 W U TYPICAL PERFOR A CE CHARACTERISTICS LTC2234: INL, 2V Range 1.0 0.8 0.6 0.4 0.2 0 – 0.2 – 0.4 – 0.6 – 0.8 – 1.0 0 256 512 768 1024 OUTPUT CODE 2234 G01 LTC2234: SNR vs ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS LTC2234: SFDR and SNR vs Sample Rate, 2V Range 30MHz, –1dB IN 85 SFDR SNR 100 120 140 160 ...

Page 8

LTC2234 W U TYPICAL PERFOR A CE CHARACTERISTICS LTC2234: 8192 Point FFT 30MHz, –1dB, 2V Range IN 0 – 10 – 20 – 30 – 40 – 50 – 60 – 70 – 80 – 90 – 100 ...

Page 9

CTIO (Pin 1): Positive Differential Analog Input – (Pin 2): Negative Differential Analog Input. IN REFHA (Pins 3, 4): ADC High Reference. Bypass to Pins 5, 6 with 0.1µF ceramic ...

Page 10

LTC2234 U U FUNCTIONAL BLOCK DIAGRA + A IN INPUT FIRST PIPELINED S/H ADC STAGE – 1.6V CM REFERENCE 2.2µF RANGE SELECT REF SENSE BUF 10 W SECOND PIPELINED THIRD PIPELINED ADC STAGE ADC STAGE REFH REFL ...

Page 11

DIAGRA S ANALOG N INPUT – ENC + ENC D0-D9, OF CLOCKOUT OE DATA Timing Diagram – ...

Page 12

LTC2234 U U APPLICATIO S I FOR ATIO DYNAMIC PERFORMANCE Signal-to-Noise Plus Distortion Ratio The signal-to-noise plus distortion ratio [S/(N + D)] is the ratio between the RMS amplitude of the fundamental input frequency and the RMS amplitude of all ...

Page 13

U U APPLICATIO S I FOR ATIO CONVERTER OPERATION As shown in Figure 1, the LTC2234 is a CMOS pipelined multistep converter. The converter has five pipelined ADC stages; a sampled analog input will result in a digitized value five ...

Page 14

LTC2234 U U APPLICATIO S I FOR ATIO NMOS transistors. The capacitors shown attached to each input (C ) are the summation of all other capaci- PARASITIC tance associated with each input. During the sample phase when ENC is low, ...

Page 15

U U APPLICATIO S I FOR ATIO signal at its optimum DC level. Terminating on the trans- former secondary is desirable, as this provides a common mode path for charging glitches caused by the sample and hold. Figure 3 shows ...

Page 16

LTC2234 U U APPLICATIO S I FOR ATIO 0.1µF 12Ω ANALOG INPUT 0.1µF 25Ω T1 0.1µF 25Ω 12Ω MA/COM ETC1-1-13 RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE Figure 6. Recommended Front End Circuit for Input Frequencies Between 100MHz and ...

Page 17

U U APPLICATIO S I FOR ATIO Input Range The input range can be set based on the application. The 2V input range will provide the best signal-to-noise perfor- mance while maintaining excellent SFDR. The 1V input range will have ...

Page 18

LTC2234 U U APPLICATIO S I FOR ATIO DIGITAL OUTPUTS Table 1 shows the relationship between the analog input voltage, the digital data bits and the overflow bit. Table 1. Output Codes vs Input Voltage + – A – A ...

Page 19

U U APPLICATIO S I FOR ATIO Overflow Bit The converter is either overranged or underranged when OF outputs a logic high. Output Clock The ADC has a delayed version of the ENC as a digital output, CLOCKOUT. The CLOCKOUT ...

Page 20

LTC2234 U U APPLICATIO S I FOR ATIO Clock Sources for Undersampling Undersampling raises the bar on the clock source and the higher the input frequency, the greater the sensitivity to clock jitter or phase noise. A clock source that ...

Page 21

... C16 A2 SCL 4 5 0.1µF A3 SDA 24LC025 3.3V C25 C29 C30 C31 4.7µF 0.1µF 0.1µF 0.1µF PWR GND U1 R1 LTC2224IUK 24.9Ω 12pF LTC2234IUK 24.9Ω 12pF LTC2224IUK 12.4Ω 8.2pF LTC2234IUK 12.4Ω 8.2pF 3201S-40G1 2234 AI01 C32 0.1µ ...

Page 22

LTC2234 U U APPLICATIO S I FOR ATIO Layer 1 Component Side Layer 3 Power Plane Silkscreen Top Layer 2 GND Plane Layer 4 Bottom Side 2234fa ...

Page 23

... PIN 1 TOP MARK (SEE NOTE 6) 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package 48-Lead Plastic QFN (7mm × ...

Page 24

... High IIP3: 20dBm at 1.9GHz, Integrated LO Quadrature Generator High IIP3: 21.5dBm at 900MHz, Integrated LO Quadrature Generator High IIP3: 21dBm at 800MHz, Integrated LO Quadrature Generator 4.5V to 5.25V Supply, 25dBm IIP3 at 900MHz 12.5dB, 500Ω Single-Ended RF and LO Ports www.linear.com ● 2234fa LT 0106 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2004 ...

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