BUF600 Datasheet, PDF (4/14 Pages) Burr-Brown (TI) – HIGH-SPEED BUFFER AMPLIFIER

INPUT PROTECTION
Static damage has been well recognized for MOSFET de-
vices, but any semiconductor device deserves protection
from this potentially damaging source. The BUF600 and
BUF601 incorporate on-chip ESD protection diodes as shown
in Figure 1. This eliminates the need for the user to add
external protection diodes, which can add capacitance and
degrade AC performance.
External
Pin
+V_CC
ESD Protection Diodes
internally connected to
all pins.
Internal
Circuitry
–V_CC
FIGURE 1. Internal ESD Protection.
All input pins on the BUF600 and BUF601 are internally
protected from ESD by means of a pair of back-to-back
reverse-biased diodes to the power supplies as shown. These
diodes will begin to conduct when the input voltage exceeds
either power supply by about 0.7V. This situation can occur
with loss of the amplifier’s power supplies while a signal
source is still present. The diodes can typically withstand a
continuous current of 30mA without destruction. To insure
long term reliability, however, the diode current should be
externally limited to 10mA or so whenever possible.
The internal protection diodes are designed to withstand
2.5kV (using the Human Body Model) and will provide
adequate ESD protection for most normal handling proce-
dures. However, static damage can cause subtle changes in
amplifier input characteristics without necessarily destroy-
ing the device. In precision amplifiers, this may cause a
noticeable degradation of offset and drift. Therefore, static
protection is strongly recommended when handling the
BUF600 and BUF601.
TYPICAL PERFORMANCE CURVES
At V_CC = ±5V, R_LOAD = 10kΩ, and T_A = 25°C, unless otherwise noted.
OFFSET VOLTAGE vs TEMPERATURE
5
4
3
2
1
BUF600
0
–1
–2
BUF601
–3
–4
–5
–40 –20
0
20
40
60
Temperature (°C)
80 100
INPUT BIAS CURRENT vs TEMPERATURE
2
1.8
BUF601
1.6
1.4
1.2
1
0.8
BUF600
0.6
0.4
0.2
0
–40 –20
0
20
40
60
Temperature (°C)
80 100
INPUT IMPEDANCE vs FREQUENCY BUF600
10M
1M
100k
10k
1k
100
1k
10k 100k
1M
10M 100M
Frequency (Hz)
INPUT IMPEDANCE vs FREQUENCY BUF601
10M
1M
100k
10k
1k
100
1k
10k 100k
1M
10M 100M
Frequency (Hz)
®
BUF600, 601
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