LINEAR TECHNOLOGY LTC2262 Technical data

14-/12-Bit 150Msps

25Msps

40Msps

65Msps

80Msps

105Msps

125Msps

150Msps

35mW

Power

Consumption

49mW

81mW

89mW

106mW

127mW

1.8V Single ADCs, CMOS,
DDR CMOS or DDR LVDS Outputs

149mW

2256-14

2257-14

2258-14

2259-14

2260-14

2261-14

2262-14

2256-12

2257-12

2262-12

6x6

QFN

2258-12

2259-12

2260-12

2261-12

14-Bit

73.2dB SNR

12-Bit

70.6dB SNR

CLKOUT

CLKOUT

OF

D13/D0

D12/D0

•

•

•

D2/D0

D1/D0

D0

OF

D13

D12D2D1

D0

RANDOMIZER

ON

1.8V ADC Family

Features

n

Pin-Compatible Family of 14- /12-Bit,

25Msps to 150Msps ADCs

n

Single 1.8V Supply

n

Flexible Digital Interface:

CMOS, DDR CMOS or DDR LVDS

n

Selectable Input Ranges: 1V

n

800MHz Full-Power Bandwidth S/H

n

Optional Data Output Randomizer

n

Alternate Bit Polarity Mode

n

Optional Clock Duty Cycle Stabilizer

n

Shutdown and Nap Modes

n

Serial SPI Port for Configuration

n

Easy Evaluation Using PScope™ Tool

to 2V

P-P

P-P

Digital Output Randomizer Reduces

Digital Feedback

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered
trademarks and PScope is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.

Alternate Bit Polarity Mode

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Encoded Data

LTC2262-14

FPGA or ASIC

DECODED
DATA

RAW

DATA

7×

7×

OUTPUT CODE

10 1010 1010 1001
10 1010 1010 1000
10 1010 1010 1011
10 1010 1010 1010
01 0101 0101 0101
01 0101 0101 0100
01 0101 0101 0111

7 Bits 0 to 1
7 Bits 1 to 0
at Mid-Scale

FREQUENCY (MHz)

0

–80

–90

–100

–110

–120

–130

–50

–60

–70

–40

–30

–20

–1001020304050

60

FREQUENCY (MHz)

0

–130

–80

–90

–100

–110

–120

–50

–60

–70

–40

–30

–20

–10

0102030405060

The LTC®2262 family offers a new, proprietary feature to
reduce digital feedback on the circuit board. The alternate
bit polarity mode inverts all of the odd bits before the
output buffers to equalize the number of ones and zeroes
switching. This method effectively cancels the large ground
plane currents that contribute to digital feedback when
sampling small input signals crossing mid-scale.

When alternate bit polarity (ABP) mode is enabled, all of the odd bits are inverted before the output buffers. The even bits are not
affected. This method can work in combination with the digital output randomizer to help reduce digital currents in the circuit board
ground plane that cause digital noise, particularly for very small analog input signals.

ABP = Off, RAND = Off

ABP = On, RAND = On

LTC2261-14, 125Msps, AIN = 70MHz, –65dBFS

Averaged 128k Point FFTs

www.linear.com/2262-14 n 1-800-4-LINEAR

0511