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参数资料
| 型号： | 5962-9169201QXC |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 2-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP28 |
| 封装： | CERAMIC, DIP-28 |
| 文件页数： | 11/39页 |
| 文件大小： | 334K |
| 代理商： | 5962-9169201QXC |
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peak current ISEG, plus the 0.8V headroom required by
the driver output stages. The MAX6954 correctly regu-
lates ISEG with a supply voltage above this minimum
voltage. If the supply drops below this minimum volt-
age, the driver output stages may brown out, and be
unable to regulate the current correctly. As the supply
voltage drops further, the LED segment drive current
becomes effectively limited by the output driver's on-
resistance, and the LED drive current drops. The char-
acteristics of each individual LED in a display digit are
well matched, so the result is that the display intensity
dims uniformly as supply voltage drops out of regula-
tion and beyond.
Computing Power Dissipation
The upper limit for power dissipation (PD) for the
MAX6954 is determined from the following equation:
PD = (V+ x 35mA) + (V+ - VLED) (DUTY x ISEG x N)
where:
V+ = supply voltage
DUTY = duty cycle set by intensity register
N = number of segments driven (worst case is 17)
VLED = LED forward voltage at ISEG
ISEG = segment current set by RSET
PD = Power dissipation, in mW if currents are in mA
Dissipation example:
ISEG = 30mA, N = 17, DUTY = 15/16,
VLED = 2.4V at 30mA, V+ = 3.6V
PD = 3.6V (35mA) + (3.6V - 2.4V)(15/16 x
30mA x 17) = 0.700W
Thus, for a 36-pin SSOP package (TJA = 1 / 0.0118 =
+85°C/W from Operating Ratings), the maximum
allowed ambient temperature TA is given by:
TJ(MAX) = TA + (PD x TJA) = +150°C
= TA + (0.700 x +85°C/W)
So TA = +90.5°C. Thus, the part can be operated safely
at a maximum package temperature of +85°C.
Power Supplies
The MAX6954 operates from a single 2.7V to 5.5V
power supply. Bypass the power supply to GND with a
0.1F capacitor as close to the device as possible. Add
a 47F capacitor if the MAX6954 is not close to the
board's input bulk decoupling capacitor.
Terminating the Serial Interface
The MAX6954 uses fixed voltage thresholds of 0.6V
and 1.8V for the 4-wire interface inputs. These fixed
thresholds allow the MAX6954 to be controlled by a
host operating from a lower supply voltage than the
MAX6954; for example, 2.5V. The fixed thresholds also
reduce the logic input noise margin when operating the
MAX6954 from a higher supply voltage, such as 5V. At
higher supply voltages, it may be necessary to fit termi-
nation components to the CLK, DIN, and
CS inputs to
avoid signal reflections that the MAX6954 could
respond to as multiple transitions. Suitable termination
components can be either a 33pF capacitor or 4.7kΩ
resistor fitted from each of the CLK, DIN, and
CS inputs
to GND.
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
______________________________________________________________________________________
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相关代理商/技术参数 |
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| 5962-9169301M2A | 制造商:Texas Instruments 功能描述:-LIFETIME BUYS TIL 03/03 |
| 5962-9169701MMA | 制造商:e2v Aerospace & Defense 功能描述:SMD MKD 87C51RC-16 PHI-JLCC |
| 5962-9169701MUA | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intel 功能描述: |
| 5962-9169702MUA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 5962-9172201MEA | 制造商:e2v 功能描述:Counter Single 4-Bit Binary UP 16-Pin CDIP 制造商:e2v technologies 功能描述:Counter Single 4-Bit Binary UP 16-Pin CDIP |
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