MAX5195EGM MAXIM [Maxim Integrated Products], MAX5195EGM Datasheet - Page 9

• Manufacturer Part Number: MAX5195EGM
• Description: 14-Bit, 260Msps High-Dynamic Performance DAC
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX5195 is a high-performance, 14-bit, segmented
current-source array DAC (Figure 1) capable of operat-
ing with clock speeds up to 260MHz. The converter
consists of separate input and DAC registers, followed
by a current-source array. This current-source array is
capable of generating differential full-scale currents in
the range of 10mA to 20mA. An internal R2R resistor
network, in combination with external 27.4Ω termination
resistors, convert these differential output currents into a
differential output voltage with a peak-to-peak output
voltage range of 0.5V to 1V. An integrated 1.2V
bandgap reference, control amplifier, and user-selec-
table, external resistor determine the data converter’s
full-scale output range.
Figure 1. Simplified MAX5195 Block Diagram
REFOUT
CLKN
CLKP
REFIN
RSET
_______________________________________________________________________________________
Detailed Description
REFERENCE
1.2V
Architecture
14-Bit, 260Msps High-Dynamic
D0N/D0P–D13N/D13P
BIAS
CURRENT-SOURCE
14
INPUT REGISTER
ARRAY
The MAX5195 supports operation with the on-chip 1.2V
bandgap reference or an external reference voltage
source. REFIN serves as the input for an external refer-
ence source, and REFOUT provides a 1.2V output volt-
age, if the internal reference is used. For internal
reference operation, REFIN and REFOUT must be con-
nected together and decoupled to AGND with a 1µF
capacitor in parallel with a 0.1µF capacitor for stable
operation.
The MAX5195 reference circuit also employs a control
amplifier, designed to regulate the full-scale current I
for the differential current outputs of the MAX5195. For
stable operation, the output AMPOUT of this amplifier
must be bypassed with a 3kΩ resistor in parallel with a
1.5µF tantalum capacitor to AGND. Configured as a
voltage-to-current amplifier, the output current can be
calculated as follows:
INPUT LATCH
DECODER
Internal Reference and Control Amplifier
NETWORK
DV
R2R
CC
Performance DAC
I
FS
= 64
MAX5195
DGND
✕
I
REF
- 1LSB
OUTP
OUTN
AGND
AV
CC
FS
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