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DESCRIPTION
Demonstration circuit 2071A features the LTC
The LTC2374/LTC2373/LTC2372 are low noise, high speed,
8-channel, 16-/18-bit successive approximation register
(SAR) ADCs. The following text refers to the
but applies to all parts in the family, the only differences
being the number of bits and the maximum sample rate.
Operating from a single 5V supply, the LTC2373-18 has a
highly configurable, low crosstalk, 8-channel input multi-
plexer, supporting fully differential, pseudo-differential uni-
polar and pseudo-differential bipolar analog input ranges.
The DC2071 demonstrates the DC and AC performance of
the LTC2373-18 in conjunction with the DC590 and DC890
data collection boards. Use the DC590 to demonstrate DC
ASSEMBLY OPTIONS
Table 1. DC2071A Assembly Options
Assembly Version
DC2071A-A
DC2071A-B
DC2071A-C
DC2071A-D
DC2071A-E
16-Bit/18-Bit, 1.6Msps/1Msps/500ksps
2373 family.
®
LTC2373-18
U1 Part Number
LTC2373CUH-18
LTC2372CUH-18
LTC2374CUH-16
LTC2373CUH-16
LTC2372CUH-16
DEMO MANUAL DC2071A
LTC2374/LTC2373/LTC2372
8-Channel, SAR ADCs
performance such as peak-to-peak noise and DC linearity.
Use the DC890 if precise sampling rates are required or to
demonstrate AC performance such as SNR, THD, SINAD
and SFDR. The demonstration circuit 2071 is intended to
demonstrate recommended grounding, component place-
ment and selection, routing and bypassing for this ADC.
Several suggested driver circuits for the analog inputs
will be presented.
Design files for this circuit board, including the
schematic and BOM, are available at
http://www.linear.com/demo/DC2071A
L, LT, LTC, LTM, 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.
Max Conversion Rate
1Msps
0.5Msps
1.6Msps
1Msps
0.5Msps
Number of Bits
Max CLK IN Frequency
18
18
16
16
16
62MHz
31MHz
86.4MHz
50MHz
25MHz
dc2071afc
1
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Related Manuals for Linear Technology LTC2374
Summary of Contents for Linear Technology LTC2374
- Page 1 LTC2373-18 in conjunction with the DC590 and DC890 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and data collection boards. Use the DC590 to demonstrate DC QuikEval and PScope are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Board Photo
DEMO MANUAL DC2071A BOARD PHOTO DEFAULT INPUT LEVELS –16V +16V 0V TO 4.096V 0V TO 4.096V ±8.192V DC890 0V TO 4.096V ±4.096V DC590 DC2026 ±4.096V 100MHz MAX 3.3V PP Figure 1. DC2071A Connection Diagram dc2071afc... - Page 3 DEMO MANUAL DC2071A DC890 QUICK START PROCEDURE Check to make sure that all switches and jumpers are Run the PScope™ software (Pscope.exe version K88 or set as shown in the connection diagram of Figure 1. The later) which can be downloaded from www.linear.com/ default connections configure the ADC to use the onboard designtools/software.
- Page 4 DEMO MANUAL DC2071A DC2071A SETUP DC Power desired, the LTC6655-4.096 reference (U9) can be used by setting the REF jumper (JP1) to the EXT position and The DC2071A requires ±16VDC and draws +100mA/ installing a 0Ω resistor in the R19 position. –40mA.
- Page 5 DEMO MANUAL DC2071A DC2071A SETUP 10µF 10µF 6.3V 6.3V 0.1µF 24.9 0V TO 4.096V LT6237 15pF 1206 U24B – 0.1µF 3 2 1 +IN1 V – AC DC COUPLING R101 24.9 R137 R104 10µF R106 24.9 6.3V 10µF R109 6.3V –...
- Page 6 DEMO MANUAL DC2071A DC2071A SETUP 1µF 0.1µF 10µF 10µF 6.3V SHDN 6.3V + IN1 0V TO OUT1 4.096V – R100 15pF 1206 – IN1 LT6350 3 2 1 R103 R102 AC DC – COUPLING OUT2 + IN2 – 1µF 10µF 0.1µF 6.3V –...
- Page 7 DEMO MANUAL DC2071A DC2071A SETUP 0.1µF REFBUF 10µF 0805 REFBUF BUFOUT 47µF CCI0 1210 10µF 0.1µF 0.1µF LT6237 LT6237 0805 – R129 24.9 1200pF 4.7µF 1000pF 1200pF R130 R131 LTC237X BUSY RESET 3300pF 3300pF – 3300pF 1000pF 1500pF 0.1µF 1500pF 24.9 LT6237 –...
- Page 8 DEMO MANUAL DC2071A DC2071A SETUP DC890 Data Collection at a frequency of approximately 1kHz. The input signal level is approximately –1dBFS. A typical FFT obtained For SINAD, THD or SNR testing, a low noise, low distortion with DC2071A is shown in Figure 7. Note that to calculate generator such as the B&K Type 1051 or Stanford Research the real SNR, the signal level (F1 amplitude = –1.001dB) SR1 should be used.
- Page 9 DEMO MANUAL DC2071A DC2071A SETUP exercise a small subset of the possible output codes. To change the default settings for the LTC2373-18 se- The proper method is to pick an M/N frequency for the quencer in PScope, click on the Set Demo Bd Options input sine wave frequency.
- Page 10 DEMO MANUAL DC2071A DC2071A SETUP DC590 Data Collection and routing of the various components associated with the ADC. Here are some things to remember when lay- Due to the relatively low and somewhat unpredictable ing out a board for the LTC2373-18. A ground plane is sample rate of the DC590, its usefulness is limited to necessary to obtain maximum performance.
- Page 11 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 12 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. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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