MAX5195EGM MAXIM [Maxim Integrated Products], MAX5195EGM Datasheet - Page 12

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

With a full-scale current of 10mA (20mA), both outputs
OUTP and OUTN achieve a 0.25V (0.5V) voltage swing
each, resulting in a 0.5V
signal. For applications that require an even smaller
output voltage swing, the termination resistor value R
can be as low as 0Ω.
14-Bit, 260Msps High-Dynamic
Performance DAC
Figure 5. Simplified Output Architecture
Figure 6. Differential Coupling Using a Wideband RF Transformer
12
AGND
AV
______________________________________________________________________________________
CC
285Ω
R
R2R
AMPOUT
14
D0–D13
285Ω
R
MAX5195
R2R
MAX5195
P-P
(1V
P-P
R
THE INTERNAL R2R RESISTOR
NETWORK IN PARALLEL WITH THE
EXTERNAL TERMINATION RESISTOR.
AV
AV
LOAD
CC
CC
) differential output
AGND, DGND
AV
R
27.4Ω
R
27.4Ω
IS THE COMBINED LOAD OF
T
T
CC
, DV
CC
R
R
LOAD
LOAD
OUTN
OUTP
= 25Ω
= 25Ω
T
The proportional, differential output voltages can then
be used to drive a wideband RF transformer or a fast,
low-noise, low-distortion operational amplifier to convert
the differential voltage into a single-ended output.
The MAX5195 analog outputs can also be configured in
single-ended mode. For more details on different output
configurations, see the Applications Information section.
A wideband RF transformer such as the TTWB1010 (1:1
turns ratio) from Coilcraft can be used to convert the
MAX5195 differential output signal to a single-ended
signal (Figure 6). As long as the generated output
spectrum is within the passband of the transformer, a
differentially coupled transformer provides the best dis-
tortion performance. Additionally, the transformer helps
to reject noise and even-order harmonics, provides
electrical isolation, and is capable of delivering more
power to the load.
Figure 7a shows an unbuffered single-ended output,
which is suitable for applications requiring a unipolar
voltage output. The nominal termination resistor load of
27.4Ω (referred to AV
OUTP
OUTN
AV
AV
CC
CC
R
27.4Ω
R
27.4Ω
T
T
Single-Ended Unbuffered Output
Applications Information
WIDEBAND RF TRANSFORMER
PERFORMS DIFFERENTIAL-TO-
SINGLE-ENDED CONVERSION.
TTWB1010
1 : 1
Differential Coupling Using a
CC
Wideband RF Transformer
) results in a differential output
V
OUT
AGND
, SINGLE ENDED
AGND
Configuration