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参数资料
| 型号： | DAC5687IPZP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.0104 us SETTLING TIME, 16-BIT DAC, PQFP100 |
| 封装： | GREEN, PLASTIC, HTQFP-100 |
| 文件页数： | 54/79页 |
| 文件大小： | 2490K |
| 代理商： | DAC5687IPZP |
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C1 + t1 1 *
t
2
t
3
C2 +
t
1 * t2
t
3
R1 +
t
32
t
1 (t3 * t2)
t1 +
K
d
Kvco
w2
d
tan f
d )
sec f
d
t2 +
1
w
d
tan f
d )
sec f
d
t3 +
tan f
d )
sec f
d
w
d
DAC5687 Passive Interface to Analog Quadrature Modulators
SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006
where,
and
charge pump current: iqp = 1 mA
vco gain: KVCO = 2π × GVCO rad/V
FVCO/FDATA: N = {2, 4, 8, 16, 32}
phase detector gain: Kd = iqp × (2 × N) – 1 A/rad
An Excel spreadsheet is provided by Texas Instruments for automatically calculating the values for C1, C2,
and R.
Completing the example given previously with:
Parameter
Value
Units
GVCO
1.30E+02
MHz/V
ωd
0.50E+00
MHz
N
4
φd
80
Degrees
The component values are:
C1 (F)
C2 (F)
R (
)
3.74E–08
2.88E–10
9.74E+01
As the PLL characteristics are not sensitive to these components, the closest 20% tolerance capacitor and 1%
tolerance resistor values can be used. If the calculation results in a negative value for C2 or an unrealistically
large value for C1, then the phase margin may need to be reduced slightly.
The DAC5687 has a maximum 20-mA full-scale output and a compliance range of AVDD ±0.5 V. The TRF3701
or TRF3702 analog quadrature modulators (AQM) require a common mode of approximately 3.7 V and 1.5 V to
2-VPP differential swing. A resistive network as shown in Figure 68 can be used to translate the common-mode
voltage between the DAC5687 and TRF3701 or TRF3702. The voltage at the DAC output pins for a full-scale
sine wave is centered at approximately AVDD with a 1-VPP single-ended (2-VPP differential) swing. The voltage at
the TRF3701/2 input pins is centered at 3.7 V and swings 0.76-VPP single-ended (1.52-VPP differential), or 2.4 dB
of insertion loss.
58
Copyright 2005–2006, Texas Instruments Incorporated
Product Folder Link(s): DAC5687
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| DAC5687IPZPRG4 | 功能描述:数模转换器- DAC 16-bit 500 MSPS 2-8x Interpolat’g Dual-Ch RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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