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dc1525af

DEMO MANUAL DC1525A

DESCRIPTION

LTC2175-14/-12,

LTC2174-14/-12, LTC2173-14/-12, LTC2172-14/-12,

LTC2171-14/-12, LTC2170-14/-12

12-Bit/14-Bit, 25Msps to 125Msps Quad ADCs

Demonstration circuit 1525A supports a family of

14-Bit/12-Bit 25Msps to 125Msps ADCs. Each assem-

bly features one of the following devices: LTC

2175-14,

LTC2175-12, LTC2174-14, LTC2174-12, LTC2173-14,

LTC2173-12, LTC2172-14, LTC2172-12, LTC2171-14,

LTC2171-12, LTC2170-14, LTC2170-12 high speed,

quad ADCs.

The versions of the 1525A demo board are listed in Table1.

Depending on the required resolution and sample rate,

L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks

and QuikEval and PScope are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

the DC1525A is supplied with the appropriate ADC. The

circuitry on the analog inputs is optimized for analog input

frequencies from 5MHz to 140MHz. Refer to the data sheet

for proper input networks for different input frequencies.

Design files for this circuit board are available at

http://www.linear.com/demo

Table 1. DC1525A Variants

DC1525A VARIANTS ADC PART NUMBER RESOLUTION MAXIMUM SAMPLE RATE INPUT FREQUENCY

1525A-A LTC2175-14 14-Bit 125Msps 5MHz to 140MHz

1525A-B LTC2174-14 14-Bit 105Msps 5MHz to 140MHz

1525A-C LTC2173-14 14-Bit 80Msps 5MHz to 140MHz

1525A-D LTC2172-14 14-Bit 65Msps 5MHz to 140MHz

1525A-E LTC2171-14 14-Bit 40Msps 5MHz to 140MHz

1525A-F LTC2170-14 14-Bit 25Msps 5MHz to 140MHz

1525A-G LTC2175-12 12-Bit 125Msps 5MHz to 140MHz

1525A-H LTC2174-12 12-Bit 105Msps 5MHz to 140MHz

1525A-I LTC2173-12 12-Bit 80Msps 5MHz to 140MHz

1525A-J LTC2172-12 12-Bit 65Msps 5MHz to 140MHz

1525A-K LTC2171-12 12-Bit 40Msps 5MHz to 140MHz

1525A-L LTC2170-12 12-Bit 25Msps 5MHz to 140MHz

Summary of content (10 pages)

PAGE 1
DEMO MANUAL DC1525A LTC2175-14/-12, LTC2174-14/-12, LTC2173-14/-12, LTC2172-14/-12, LTC2171-14/-12, LTC2170-14/-12 12-Bit/14-Bit, 25Msps to 125Msps Quad ADCs DESCRIPTION Demonstration circuit 1525A supports a family of 14-Bit/12-Bit 25Msps to 125Msps ADCs. Each assembly features one of the following devices: LTC®2175-14, LTC2175-12, LTC2174-14, LTC2174-12, LTC2173-14, LTC2173-12, LTC2172-14, LTC2172-12, LTC2171-14, LTC2171-12, LTC2170-14, LTC2170-12 high speed, quad ADCs.
PAGE 2
DEMO MANUAL DC1525A PERFORMANCE SUMMARY (TA = 25°C) PARAMETER CONDITION VALUE Supply Voltage: DC1525A Depending on Sampling Rate and the A/D Converter Provided, this Supply Must Provide Up to 500mA. Optimized for 3V [3V ↔ 6.0V Min/Max] Analog Input Range Depending on SENSE Pin Voltage 1VP-P to 2VP-P Logic Input Voltages Logic Output Voltages (Differential) Minimum Logic High 1.3V Maximum Logic Low 0.6V Nominal Logic Levels (100Ω Load, 3.5mA Mode) 350mV/1.
PAGE 3
DEMO MANUAL DC1525A QUICK START PROCEDURE 3.5V TO 6V ANALOG INPUTS CHANNEL 1 TO PROVIDED POWER SUPPLY CHANNEL 2 USE PROVIDED USB CABLE PARALLEL/SERIAL CHANNEL 3 CHANNEL 4 dc1525a F01 SINGLE-ENDED ENCODE CLOCK USE PROVIDED DC1075 Figure 1. DC1525A Setup Analog Input Network For optimal distortion and noise performance the RC network on the analog inputs may need to be optimized for different analog input frequencies.
PAGE 4
DEMO MANUAL DC1525A QUICK START PROCEDURE using a sinusoidal signal generator a squaring circuit can be used. Linear Technology also provides demo board DC1075A that divides a high frequency sine wave by four, producing a low jitter square wave for best results with the LTC2175. Using bandpass filters on the clock and the analog input will improve the noise performance by reducing the wideband noise power of the signals.
PAGE 5
DEMO MANUAL DC1525A QUICK START PROCEDURE This menu allows any of the options available for the LTC2175 family to be programmed serially.
PAGE 6
DEMO MANUAL DC1525A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 C1, C17 CAP., X5R, 2.2μF, 10V, 10% 0603 NIC, NMC0603X5R225K10TRPF 2 19 C2, C3, C5, C7-C9, C15, C16, C18, C28, C29, C30, C36, C38, C48, C52, C58, C59, C67 CAP., X5R, 0.1μF, 10V, 10% 0402 AVX, 0402ZD104KAT2A 3 1 C4 CAP., X5R, 1μF, 10V, 10% 0402 MURATA, GRM155R61A105ME15 4 1 C6 CAP., TANT, 100μF, 10V% 6032 AVX, TAJW107K010R 5 3 C10, C53, C54 CAP.
PAGE 7
DEMO MANUAL DC1525A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 37 1 U2 I.C., LT1763CS8-1.8, SO8 LINEAR, LT1763CS8-1.8#TRPBF 38 1 U3 I.C., 24LC32A, TSSOP-8 MICROCHIP, 24LC32A I /ST 1 1 DC1525A GENERAL BOM 2 1 U1 (DC1525A-A) I.C., LTC2175-14, 7mm × 8mm QFN LINEAR., LTC2175IUKG-14#PBF 3 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1525A 1 1 DC1525A GENERAL BOM 2 1 U1 (DC1525A-B) I.C., LTC2174-14, 7mm × 8mm QFN LINEAR.
PAGE 8
A B C D CLK- CLK+ GND 5 LTC2175IUKG-14 LTC2174IUKG-14 LTC2173IUKG-14 LTC2172IUKG-14 LTC2171IUKG-14 LTC2170IUKG-14 DC1525A-B DC1525A-C DC1525A-D DC1525A-E DC1525A-F opt L8 opt D1 R63 R61 0 C10 1uF 3 2 1 14 14 14 25 40 4 DC1525A-L DC1525A-K DC1525A-J DC1525A-I 80 65 DC1525A-H 105 14 VDD OVDD L7 R65 0 U1 R40 49.9 R41 49.9 opt opt R42 opt R43 C29 0.
PAGE 9
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D AIN4 AIN3 AIN2 J7 J6 J4 0.01uF C64 0.01uF C41 0.01uF C33 T13 C65 0.01uF C71 8.2pF C70 8.2pF 5 4 5 R91 86.6 56nH R90 86.
PAGE 10
DEMO MANUAL DC1525A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use.