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| 型號： | LTC1052CSW#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CHOP-STBL LONOIS16SOIC |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 系列： | LTCMOS™ |
| 放大器類型： | 斷路器（零漂移） |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 4 V/µs |
| 增益帶寬積： | 1.2MHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 0.5µV |
| 電流 - 電源： | 1.7mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 16 V，±2.38 V ~ 8 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SO |
| 包裝： | 管件 |
LTC1052/LTC7652
8
1052fa
Figure 1b. LTC1052 Block Diagram
Sampling Cycle
THEORY OF OPERATIO
U
LTC1052/7652 TO02
+
–
gm6
+IN
–IN
S1
S3
VREF
RL1
V–
+
–
+
–
+
S2
RL5
VOUT
RL4
CEXT A
CEXT B
RL2
l3
l1
δl
l2
C1
C2
+
–
gm1
gm2
gm3
gm4
gm5
APPLICATIO S I FOR ATIO
WU
UU
EXTERNAL CAPACITORS
CEXTA and CEXTB are the holding elements of a sample-
and-hold circuit. The important capacitor characteristics
are leakage current and dielectric absorption. A high
quality film-type capacitor such as mylar or polypropylene
provides excellent performance. However, low grade
capacitors such as ceramic are suitable in many
applications.
Capacitors with very high dielectric absorption (ceramic)
can take several seconds to settle after power is first
turned on. This settling appears as clock ripple on the
output and, as the capacitor settles, the ripple gradually
disappears. If fast settling after power turn-on is
important, mylar or polypropylene is recommended.
Above 85°C, leakage, both from the holding capacitors
and the printed circuit board, becomes important. To
maintain the capabilities of the LTC1052 it may be
necessary to use Teflon capacitors and Teflon standoffs
when operating at 125°C (see Achieving Picoampere/
Microvolt Performance).
CEXTA and CEXTB are normally in the range of 0.1F
to 1.0F. All specifications are guaranteed with 0.1F and
the broadband noise (refer to Typical Performance Char-
acteristics) is only very slightly degraded with 0.1F.
Output clock ripple is not present for capacitors of 0.1F
or greater at any temperature.
On competitive devices, connecting CEXTA and CEXTB to
V– causes an increase in amplifier noise. Design changes
have eliminated this problem on the LTC1052. On the
14-pin LTC1052 and 8-pin LTC7652, the capacitors can
be returned to V– or CRETURN with no change in noise
performance.
ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE
Picoamperes
In order to realize the picoampere level of accuracy of the
LTC1052, proper care must be exercised. Leakage
currents in circuitry external to the amplifier can
significantly degrade performance. High quality insulation
should be used (e.g., Teflon, Kel-F); cleaning of all
insulating surfaces to remove fluxes and other residues
will probably be necessary—particularly for high
temperature performance. Surface coating may be
necessary to provide a moisture barrier in high humidity
environments.
Board leakage can be minimized by encircling the input
connections with a guard ring operated at a potential
close to that of the inputs: in inverting configurations, the
guard ring should be tied to ground; in noninverting
Teflon is a trademark of Dupont.
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