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參數資料
| 型號： | 5962-8770204RA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 12-BIT DAC, CDIP20 |
| 封裝： | CERAMIC, DIP-20 |
| 文件頁數： | 7/10頁 |
| 文件大小： | 166K |
| 代理商： | 5962-8770204RA |
MAX4684/MAX4685
0.5
Ω
Ω/0.8Ω
Ω Low-Voltage, Dual SPDT
Analog Switches in UCSP
Detailed Description
The MAX4684/MAX4685 are low on-resistance, low-
voltage, dual SPDT analog switches that operate from a
+1.8V to +5.5V supply. The devices are fully specified
for nominal 3V applications. The MAX4684/MAX4685
have break-before-make switching and fast switching
speeds (tON = 50ns max, tOFF = 40ns max).
The MAX4684 offers asymmetrical normally closed
(NC) and normally open (NO) RON for applications that
require asymmetrical loads (examples include speaker
headsets and internal speakers). The part features a
0.5Ω max RON for its NC switch and a 0.8Ω max RON
for its NO switch at the 2.7V supply. The MAX4685 fea-
tures a 0.8Ω max on-resistance for both NO and NC
switches at the +2.7V supply.
Applications Information
Digital Control Inputs
The MAX4684/MAX4685 logic inputs accept up to
+5.5V regardless of supply voltage. For example, with a
+3.3V supply, IN_ may be driven low to GND and high
to 5.5V. Driving IN_ rail-to-rail minimizes power con-
sumption. Logic levels for a +1.8V supply are 0.5V (low)
and 1.4V (high).
Analog Signal Levels
Analog signals that range over the entire supply voltage
(V+ to GND) are passed with very little change in on-
resistance (see
Typical Operating Characteristics). The
switches are bidirectional, so the NO_, NC_, and COM_
pins can be either inputs or outputs.
Power-Supply Sequencing and
Overvoltage Protection
Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings
may cause permanent damage to devices.
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+ before applying
analog signals, especially if the analog signal is not
current limited. If this sequencing is not possible, and if
the analog inputs are not current limited to <20mA, add
a small signal diode (D1) as shown in Figure 1. Adding
a protection diode reduces the analog range to a diode
drop (about 0.7V) below V+ (for D1). RON increases
slightly at low supply voltages. Maximum supply volt-
age (V+) must not exceed +6V. Protection diode D1
also protects against some overvoltage situations. No
damage will result on Figure 1’s circuit if the supply
voltage is below the absolute maximum rating applied
to an analog signal pin.
POSITIVE SUPPLY
COM
NO
D1
GND
Vg
V+
MAX4684
MAX4685
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
PIN
NAME
UCSP
MAX/TDFN
FUNCTION
NC_
A1, C1
5, 7
Analog Switch—Normally Closed Terminal
IN_
A2, C2
4, 8
Digital Control Input
COM_
A3, C3
3, 9
Analog Switch—Common Terminal
NO_
A4, C4
2, 10
Analog Switch—Normally Open Terminal
V+
B4
1
Positive Supply Voltage Input
GND
B1
6
Ground
EP
—
Exposed Pad. Connect EP to GND (for TDFN only.)
Pin Description
6
_______________________________________________________________________________________
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