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Linear Technology LTC6417 Manual

1.6ghz low noise differential 16-bit adc buffer
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Description
Demonstration circuit 1660B features the LTC
ferential 16-bit ADC buffer. The demo board incorporates a
variety of passive components to allow for direct connec-
tion to a two-port network analyzer or other single-ended
50Ω test system.
The demo board is easily configured to control common-
mode voltage V
CM
Quick start proceDure
DC1660B is easy to set up to evaluate the performance of
the LTC6417. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below:
1. Connect SMA cables to IN
2. Apply 5.0V between V
Tie PWRADJ (TURRET E4) to V
to approximately 150mA.
3. V
, CLHI and SHDN turrets may be left floating.
CM
This procedure contains a critical sequence. The user
must apply supply voltage before applying signal power
to the inputs or forcing a voltage to any other turrets. The
user must also remove the signal from the input ports
and voltages on any other turret before turning down
the supply voltage. This proper sequence will prevent
excessive current through the ESD diodes from any pin
Arrow.com.
Downloaded from
, clamp voltage CLHI, power adjust
+
+
and OUT
ports.
+
and GND turrets.
+
. Limit supply current
DEMO MANUAL DC1660B
1.6GHz Low Noise Differential
6417 dif-
PWRADJ, and SHUTDOWN pins. Other simple PCB modifi-
®
cations can accommodate differential input/output signals.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
to the positive supply V
each SMA connector on the board. Only J1, J3 and J5
are used in the default configuration. J2 and J4 provide
flexibility for differential input/output signals.
Table 1. DC1660B SMA Connectors
CONNECTOR
+
J1 (IN
)
–
J2 (IN
)
+
J3 (OUT
)
–
J4 (OUT
)
J5 (OR)
16-Bit ADC Buffer
+
. Table 1 shows the function of
FUNCTION
Differential input connected to input balun for single-
ended operation. Drive from a 50Ω signal source.
No external termination needed.
Differential Input. Not connected by default. Remove
capacitor C12 to drive the input balun differentially.
Differential output connected to balun for single-ended
operation. Connect to a 50Ω network/spectrum
analyzer input.
Differential Output. Not connected by default. Remove
capacitor C11 to drive the input balun differentially.
Overrange Output. Connect to oscilloscope for
monitoring the output signal.
LTC6417
dc1660bf
1

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Summary of Contents for Linear Technology LTC6417

  • Page 1 50Ω test system. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The demo board is easily configured to control common-...

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1660B Quick start proceDure DC Power Supply = 4.75V to 5.25V Signal Generator Spectrum Analyzer DC1660B F01 IMPEDANCE R2 = R6 = POWER RATIO VALUE ( ) GAIN (dB) MABA-007159-000000 24.9 TMC4-19+ TC8-1G2+ Figure 1. Proper Measurement Equipment Setup dc1660bf Arrow.com.

  • Page 3: Applications Information

    Turret E5, labeled CLHI, controls the high side clamping at port J1. The balun transformer T1 has a 1:4 impedance voltage of the LTC6417. If turret E5 is left floating, the ratio and it is matched to 50Ω at its input, when resistors LTC6417 will self-bias the CLHI pin to 2.5V on a 5.0V...

  • Page 4: Parts List

    DEMO MANUAL DC1660B parts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER C1, C3, C4, C5, C7, C9, C10, CAP ., X5R, 0.1µF , 16V, 10% 0402 AVX, 0402YD104KAT2A C13-C15, C17, C19-C21, C24 C2, C16, C18, C22 CAP ., X7R, 680pF , 50V, 10% 0402 AVX, 04025C681KAT2A C11, C12 CAP ., X7R, 0.1µF , 25V, 20% 0603...

  • Page 5: Schematic Diagram

    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 6 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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