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参数资料
| 型号： | MAX5858ECM+TD |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/23页 |
| 文件大小： | 0K |
| 描述： | IC DAC 10BIT DUAL 300MSPS 48TQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 设置时间： | 11ns |
| 位数： | 10 |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 816mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP 裸露焊盘 |
| 供应商设备封装： | 48-TQFP 裸露焊盘（7x7） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 2 电流，单极 |
| 采样率（每秒）： | 300M |
MAX5858
Dual, 10-Bit, 300Msps, Current-Output DAC with
4x/2x/1x Interpolation Filters
14
______________________________________________________________________________________
Device Power-Up and
States of Operation
At power-up, the MAX5858’s default configuration is
no-interpolation mode with a gain of 0dB and a fully
operational converter. In shutdown, the MAX5858 con-
sumes only 1A of supply current, and in standby the
current consumption is 4.4mA. Wake-up time from
standby mode to normal operation is 0.7s.
Interpolation Filters
The MAX5858 features a two stage, 2x digital interpo-
lating filter based on 43-tap and 23-tap FIR topology.
F1EN and F2EN enable the interpolation filters. F1EN
high enables the first filter for 2x interpolation and F2EN
high enables the second filter for combined 4x interpo-
lation. To bypass and disable both interpolation filters
(no-interpolation mode or 1x mode) set F1EN = F2EN =
0. When set for 1x mode the filters are powered down
and consume virtually no current. An illegal condition is
defined by: F1EN = 0, F2EN = 1 (see Table 2 for con-
figuration modes).
The programmable interpolation filters multiply the
MAX5858 input data rate by a factor of 2x or 4x to sep-
arate the reconstructed waveform spectrum and the
first image. The original spectral images, appearing
around multiples of the DAC input data rate, are attenu-
ated at least 60dB by the internal digital filters. This fea-
ture provides three benefits:
1)
Image separation reduces complexity of analog
reconstruction filters.
2)
Lower input data rates eliminate board level high-
speed data transmission.
3)
Sin(x)/x roll-off is reduced over the effective band-
width.
Figure 2 shows an application circuit and Figure 3 illus-
trates a practical example of the benefits when using
the MAX5858 in 4x-interpolation mode. The example
illustrates signal synthesis of a 20MHz IF with a
±10MHz bandwidth. The designer can consider three
options to address the design challenge. The tradeoffs
for each solution are depicted in Table 4.
CONTROL WORD
FUNCTION
PD
Power-Down. The part enters power-down mode if PD = 1.
DACEN
DAC Enable. When DACEN = 0 and PD = 0, the part enters standby mode.
F2EN
Filter Enable. When F2EN = 1 and F1EN = 1, 4x interpolation is enabled. When F2EN = 0, the interpolation
mode is determined by F1EN.
F1EN
Filter Enable. When F1EN = 1 and F2EN = 0, 2x interpolation is active. With F1EN = 0 and F2EN = 0, the
interpolation is disabled.
G3
Bit 3 (MSB) of Gain Adjust Word.
G2
Bit 2 of Gain Adjust Word.
G1
Bit 1 of Gain Adjust Word.
G0
Bit 0 (LSB) of Gain Adjust Word.
Table 1. Control Word Format and Function
MODE
PD
DACEN
F2EN
F1EN
No interpolation
010
0
2x interpolation
010
1
4x interpolation
011
1
Standby
00
X
Power-down
1X
X
Power-up
01
X
Table 2. Configuration Modes
GAIN ADJUSTMENT ON
CHANNEL A (dB)
G3
G2
G1
G0
+0.4
0000
0
1000
-0.35
1111
Table 3. Gain Difference Setting
X = Don’t care.
F1EN = 0, F2EN = 1 illegal.
MSB
LSB
PD
DACEN
F2EN
F1EN
G3
G2
G1
G0
X
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