MAX4217 Maxim, MAX4217 Datasheet - Page 9
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MAX4217
Manufacturer Part Number
MAX4217
Description
The MAX4214/MAX4215/MAX4217/MAX4219/MAX4222 are precision, closed-loop, gain of +2 (or -1) buffers featuring high slew rates, high output current drive, and low differential gain and phase error
Manufacturer
Maxim
Datasheet
1.MAX4214.pdf
(16 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX4217ESA+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
The MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
are single-supply, rail-to-rail output, voltage-feedback,
closed-loop buffers that employ current-feedback tech-
niques to achieve 600V/µs slew rates and 230MHz
bandwidths. These buffers use internal 500
to provide a preset closed-loop gain of 2V/V in the non-
inverting configuration or -1V/V in the inverting configu-
ration. Excellent harmonic distortion and differential
gain/phase performance make them an ideal choice for
a wide variety of video and RF signal-processing appli-
cations.
Local feedback around the buffer’s output stage
ensures low output impedance, which reduces gain
sensitivity to load variations. This feedback also pro-
duces demand-driven current bias to the output tran-
sistors for ±120mA drive capability, while constraining
total supply current to less than 7mA.
These devices operate from a single 3.15V to 11V
power supply or from dual supplies of ±1.575V to
±5.5V. For single-supply operation, bypass the V
to ground with a 0.1µF capacitor as close to the pin as
possible. If operating with dual supplies, bypass each
supply with a 0.1µF capacitor.
Each buffer in the MAX4214 family can be configured
for a voltage gain of 2V/V or -1V/V. For a gain of 2V/V,
ground the inverting terminal. Use the noninverting ter-
minal as the signal input of the buffer (Figure 1a).
Grounding the noninverting terminal and using the
inverting terminal as the signal input configures the
buffer for a gain of -1V/V (Figure 1b).
Figure 1a. Noninverting Gain Configuration (A
________________Detailed Description
___________Applications Information
IN
R
TIN
Closed-Loop, Rail-to-Rail Buffers with Enable
IN+
IN-
500
500
_______________________________________________________________________________________
Selecting Gain Configuration
MAX42_ _
OUT
High-Speed, Single-Supply, Gain of 2,
R
TO
Power Supplies
V
= +2V/V)
resistors
CC
R
O
OUT
pin
Since the inverting input exhibits a 500
ance, terminate the input with a 56
figured for an inverting gain in 50
(terminate with 88
input with a 49.9
Output terminating resistors should directly match
cable impedances in either configuration.
Maxim recommends using microstrip and stripline tech-
niques to obtain full bandwidth. To ensure the PC
board does not degrade the buffer’s performance,
design it for a frequency greater than 1GHz. Pay care-
ful attention to inputs and outputs to avoid large para-
sitic capacitance. Whether or not you use a constant-
impedance board, observe the following guidelines
when designing the board:
The MAX4214 family’s input range extends from
(V
increases the dynamic range for single-supply applica-
tions. The outputs drive a 2k
the power-supply rails. With smaller resistive loads, the
output swing is reduced as shown in the Electrical
Characteristics and Typical Operating Characteristics.
Figure 1b. Inverting Gain Configuration (A
IN
R
R
EE
TIN
Don’t use wire-wrapped boards. They are too induc-
tive.
Don’t use IC sockets. They increase parasitic capac-
itance and inductance.
Use surface-mount instead of through-hole compo-
nents for better high-frequency performance.
Use a PC board with at least two layers; it should be
as free from voids as possible.
Keep signal lines as short and as straight as possi-
ble. Do not make 90° turns; round all corners.
S
Input Voltage Range and Output Swing
- 100mV) to (V
IN+
IN-
500
500
in 75
CC
resistor in the noninverting case.
MAX42_ _
- 2.25V). Input ground sensing
applications). Terminate the
OUT
Layout Techniques
load to within 60mV of
R
TO
V
resistor when con-
= -1V/V)
applications
input imped-
R
O
OUT
9